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      <title>Using machine learning methods   to improve the efficiency of the cosmetological services administration process</title>
      <pubDate>Fri, 01 May 2026 01:00:47 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/pp_isofts_kiev_ua-article-893</link>
      <guid>https://harvester.nas.gov.ua/Record/pp_isofts_kiev_ua-article-893</guid>
      <author>Zakharova, O.V.</author>
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      <title>ANTHILL:   a progressive formalization language for agent-supported software projects</title>
      <pubDate>Fri, 01 May 2026 01:00:45 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/pp_isofts_kiev_ua-article-887</link>
      <guid>https://harvester.nas.gov.ua/Record/pp_isofts_kiev_ua-article-887</guid>
      <author>Shevchenko, R.S.</author>
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      <dc:date>2026</dc:date>
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      <title>Embedding  a family of logic languages with custom monadic unification in Scala</title>
      <pubDate>Fri, 01 May 2026 01:00:17 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/pp_isofts_kiev_ua-article-601</link>
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      <author>Shevchenko, R.S.</author>
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      <dc:date>2024</dc:date>
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      <title>IVAN OLEKSANDROVYCH LUKOVS’KYI (24.09.1935–15.05.2024)</title>
      <pubDate>Fri, 24 Apr 2026 01:00:34 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9908</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9908</guid>
      <author>V. Makarov, O. Mazko, O. Tymokha</author>
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      <dc:date>2026</dc:date>
      <dc:creator>V. Makarov, O. Mazko, O. Tymokha</dc:creator>
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    <item>
      <title>Бурная активность квазара 3C 273</title>
      <pubDate>Fri, 17 Apr 2026 16:14:29 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/nasplib_isofts_kiev_ua-123456789-215871</link>
      <guid>https://harvester.nas.gov.ua/Record/nasplib_isofts_kiev_ua-123456789-215871</guid>
      <author>Гусейнов, Н.А.</author>
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      <dc:date>1997</dc:date>
      <dc:creator>Гусейнов, Н.А.</dc:creator>
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    <item>
      <title>Вариации эмиссионных линий водорода в спектре φ Per</title>
      <pubDate>Fri, 17 Apr 2026 05:43:46 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/nasplib_isofts_kiev_ua-123456789-216086</link>
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      <author>Кругов, В.Д.</author>
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      <dc:date>1998</dc:date>
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      <title>Оптические характеристики газовой оболочки Ве-звезды β CMi</title>
      <pubDate>Wed, 15 Apr 2026 11:39:09 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/nasplib_isofts_kiev_ua-123456789-216013</link>
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      <author>Кругов, В.Д.</author>
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      <dc:date>1998</dc:date>
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    <item>
      <title>60 років ШАЛЕВСЬКІЙ  Інні Анатоліївні</title>
      <pubDate>Tue, 14 Apr 2026 01:00:18 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/oai:oai.metalsandcasting.com:article-325</link>
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      <author>редакція</author>
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      <dc:date>2026</dc:date>
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    <item>
      <title>Yuri Kondratiev (1953–2023)</title>
      <pubDate>Sun, 12 Apr 2026 01:00:16 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9074</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9074</guid>
      <author>Editorial Board of the &amp;quot;Ukrainian Mathematical Journal&amp;quot;</author>
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      <dc:date>2026</dc:date>
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      <title>70 років СМІРНОВУ Олексію Миколайовичу</title>
      <pubDate>Thu, 02 Apr 2026 01:01:25 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/oai:oai.metalsandcasting.com:article-296</link>
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      <author>редакція</author>
      <dc:format>Artikel</dc:format>
      <dc:date>2025</dc:date>
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    <item>
      <title>Alphabetic index of the 40th volume of the Ukrainian mathematical journal</title>
      <pubDate>Tue, 24 Mar 2026 03:45:22 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9298</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9298</guid>
      <author>Editorial Board</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Editorial Board</dc:creator>
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    <item>
      <title>Convergence, brought to life by analytical functionals, and isomorphism of analytical-function algebras</title>
      <pubDate>Tue, 24 Mar 2026 03:45:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9296</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9296</guid>
      <author>Petunin , Yu. I.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Petunin , Yu. I.</dc:creator>
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    <item>
      <title>Power of open $\sigma$-compact sets in the space of non-compact subgroups of the topological group</title>
      <pubDate>Tue, 24 Mar 2026 03:45:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9297</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9297</guid>
      <author>Piskunov , A. G.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Piskunov , A. G.</dc:creator>
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    <item>
      <title>Convergence of denominators of the Pade joint approximations of a set of confluent hypergeometric functions</title>
      <pubDate>Tue, 24 Mar 2026 03:45:18 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9294</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9294</guid>
      <author>Golub , A. P.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Golub , A. P.</dc:creator>
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    <item>
      <title>Concerning the Lindeloff theorem in $C^n$</title>
      <pubDate>Tue, 24 Mar 2026 03:45:18 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9295</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9295</guid>
      <author>Dovbush , P. V.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Dovbush , P. V.</dc:creator>
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    <item>
      <title>One class of models of quantum grid systems and their Gibbs states</title>
      <pubDate>Tue, 24 Mar 2026 03:45:17 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9293</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9293</guid>
      <author>Globa , S. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Globa , S. A.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Rational curves on the Grassmania G4.2</title>
      <pubDate>Tue, 24 Mar 2026 03:45:16 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9292</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9292</guid>
      <author>Gaidis , Ya. Yu.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Gaidis , Ya. Yu.</dc:creator>
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    <item>
      <title>Factorization of special integral operator</title>
      <pubDate>Tue, 24 Mar 2026 03:45:15 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9291</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9291</guid>
      <author>Buslaev , A. G.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Buslaev , A. G.</dc:creator>
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    <item>
      <title>Generalization of trigonometric methods of the Rogozinsky-Bernstain summation</title>
      <pubDate>Tue, 24 Mar 2026 03:45:14 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9289</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9289</guid>
      <author>Azmi , K. Al-Madi</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Azmi , K. Al-Madi</dc:creator>
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    <item>
      <title>On inequalities of the parallelogram in the Banach space and certain properties of dual mapping</title>
      <pubDate>Tue, 24 Mar 2026 03:45:13 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9288</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9288</guid>
      <author>Alber , Ya. I.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Alber , Ya. I.</dc:creator>
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    </item>
    <item>
      <title>On the root-mean-square stability of solutions for the system of linear differential equations with the Guassian coefficients</title>
      <pubDate>Tue, 24 Mar 2026 03:45:13 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9290</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9290</guid>
      <author>Bobrik , R. V.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Bobrik , R. V.</dc:creator>
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    <item>
      <title>Quantum Lee algebra of currents is a universal algebraic structure of symmetries of quite integrable dynamic systems</title>
      <pubDate>Tue, 24 Mar 2026 03:45:11 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9287</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9287</guid>
      <author>Fil , B. N.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Fil , B. N.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>On periodic solutions of wave second order equations. IV</title>
      <pubDate>Tue, 24 Mar 2026 03:45:10 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9286</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9286</guid>
      <author>Mitropolsky , Yu. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Mitropolsky , Yu. A.</dc:creator>
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    <item>
      <title>Inverse theorems of approximation of regular (in convex polygons) functions by exponential polynomials in the integral metric</title>
      <pubDate>Tue, 24 Mar 2026 03:45:09 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9285</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9285</guid>
      <author>Melnik , Yu. I.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Melnik , Yu. I.</dc:creator>
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    <item>
      <title>On spline-controllability and approximate finding of the optimal spline-control</title>
      <pubDate>Tue, 24 Mar 2026 03:45:07 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9281</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9281</guid>
      <author>Gusar , V. V.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Gusar , V. V.</dc:creator>
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    <item>
      <title>On optimal coding of vector functions</title>
      <pubDate>Tue, 24 Mar 2026 03:45:07 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9283</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9283</guid>
      <author>Korneichuk , N. P.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Korneichuk , N. P.</dc:creator>
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    <item>
      <title>Structure of periodic metabelian metahamiitonian groups with an elementary commutant of rank two</title>
      <pubDate>Tue, 24 Mar 2026 03:45:07 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9284</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9284</guid>
      <author>Kuzenny , N. F.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Kuzenny , N. F.</dc:creator>
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    <item>
      <title>Algebraic criterion of absolute (by nonlinearity) stability of stochastic systems of automatic control with a nonlinear feedback</title>
      <pubDate>Tue, 24 Mar 2026 03:45:06 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9282</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9282</guid>
      <author>Korenevsky , D. G.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Korenevsky , D. G.</dc:creator>
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    <item>
      <title>Primary multiplicative systems of almost linear operators for almost linear additive operator system without continuity conditions</title>
      <pubDate>Tue, 24 Mar 2026 03:45:05 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9280</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9280</guid>
      <author>Butsan , G. P.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Butsan , G. P.</dc:creator>
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    <item>
      <title>Subalgebras of generalized extended Galileo algebra</title>
      <pubDate>Tue, 24 Mar 2026 03:45:04 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9278</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9278</guid>
      <author>Barannik , L. F.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Barannik , L. F.</dc:creator>
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    <item>
      <title>On asymptotic decompositions of invariant manifolds. II</title>
      <pubDate>Tue, 24 Mar 2026 03:45:04 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9279</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9279</guid>
      <author>Baris , Ya. S.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Baris , Ya. S.</dc:creator>
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    <item>
      <title>Elimination of peculiarities of subharmonic, plurisubharmonic functions and their generalizations</title>
      <pubDate>Tue, 24 Mar 2026 03:45:03 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9275</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9275</guid>
      <author>Tamrazov , P. M.</author>
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      <dc:date>2025</dc:date>
      <dc:creator>Tamrazov , P. M.</dc:creator>
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      <title>Wronskians of solutions for one class of differential equations with polynomial coefficients</title>
      <pubDate>Tue, 24 Mar 2026 03:45:02 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9276</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9276</guid>
      <author>Adamchik , V. S.</author>
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      <dc:date>1988</dc:date>
      <dc:creator>Adamchik , V. S.</dc:creator>
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      <title>Estimations of deviations of transient characteristics for inhomogeneous Markovian processes</title>
      <pubDate>Tue, 24 Mar 2026 03:45:01 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9277</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9277</guid>
      <author>Anisimov , V. V.</author>
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      <dc:date>1988</dc:date>
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      <title>Evolution of spectral data and nonlinear equations</title>
      <pubDate>Tue, 24 Mar 2026 03:44:54 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9195</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9195</guid>
      <author>Sakhnovich , L. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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      <title>Semi-inversion and properties of matrices invariants</title>
      <pubDate>Tue, 24 Mar 2026 03:44:53 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9192</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9192</guid>
      <author>Mazko , A. G.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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    <item>
      <title>Periodical orgraphs and their properties</title>
      <pubDate>Tue, 24 Mar 2026 03:44:53 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9194</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9194</guid>
      <author>Pavlenko , V. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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    <item>
      <title>On the mixed product of stochastic semigroups, generated by the Wiener processes</title>
      <pubDate>Tue, 24 Mar 2026 03:44:53 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9196</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9196</guid>
      <author>Skorokhod , T. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Skorokhod , T. A.</dc:creator>
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      <title>Limited distribution of disposition of the semi continuous process with a negative infinite mean in the moment of output from the interval</title>
      <pubDate>Tue, 24 Mar 2026 03:44:53 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9197</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9197</guid>
      <author>Suprun , V. N.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Suprun , V. N.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Concerning the mapping of a circular multiply connected domain on the plane and circle with notches along the finite rectilinear segments</title>
      <pubDate>Tue, 24 Mar 2026 03:44:52 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9191</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9191</guid>
      <author>Dunduchenko , L. E.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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    <item>
      <title>Group approach to integration of the Todes infinite chain</title>
      <pubDate>Tue, 24 Mar 2026 03:44:50 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9190</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9190</guid>
      <author>Daletsky , A. Yu.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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      <slash:comments>0</slash:comments>
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    <item>
      <title>On inlegral equation of the Volterra type</title>
      <pubDate>Tue, 24 Mar 2026 03:44:49 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9188</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9188</guid>
      <author>Ashirov , S.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
      <dc:creator>Ashirov , S.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Aleksandr Yulievich Ishlinsky (on the 75th anniversary of his birth)</title>
      <pubDate>Tue, 24 Mar 2026 03:44:48 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9187</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9187</guid>
      <author>Mitropolsky , Yu. A.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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    <item>
      <title>Continuous dependence on parameters of restricted solution of the Riccati differential equation</title>
      <pubDate>Tue, 24 Mar 2026 03:44:48 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9189</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9189</guid>
      <author>Grod , I. N.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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      <title>Asymptotic study of linear-quadratic control problem</title>
      <pubDate>Tue, 24 Mar 2026 03:44:46 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9186</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9186</guid>
      <author>Yatsenko , T. P.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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      <title>Application of the projectional spectral theorem to non-commutating operators families</title>
      <pubDate>Tue, 24 Mar 2026 03:44:45 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9182</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9182</guid>
      <author>Ostrovsky , V. L.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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      <title>«Shortening» of calculating systems of differential equations with the impulse effeсt</title>
      <pubDate>Tue, 24 Mar 2026 03:44:45 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9183</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9183</guid>
      <author>Rogovchenko , S. P.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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      <title>Limited theorem for random functions, plotted according to quadratic forms from Gaussian random values</title>
      <pubDate>Tue, 24 Mar 2026 03:44:45 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9184</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9184</guid>
      <author>Ryzhov , Yu. M.</author>
      <dc:format>Artikel</dc:format>
      <dc:date>1988</dc:date>
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      <title>Averaging method in multifrequency systems with slowly varying parameters</title>
      <pubDate>Tue, 24 Mar 2026 03:44:45 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9185</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9185</guid>
      <author>Samoilenko , A. M.</author>
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      <dc:date>1988</dc:date>
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      <title>Singular single-point problem for the nonlinear delay system</title>
      <pubDate>Tue, 24 Mar 2026 03:44:43 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9181</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-9181</guid>
      <author>Norkin , S. B.</author>
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