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    <item>
      <title>On the first ruin moment for a modified risk process with immediate reflection</title>
      <pubDate>Tue, 24 Mar 2026 03:06:00 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4828</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4828</guid>
      <author>Gusak, D. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Gusak, D. V.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Control over a linear system up to a given Lyapunov function</title>
      <pubDate>Tue, 24 Mar 2026 03:05:59 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4826</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4826</guid>
      <author>Kozhametov, A. T.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Kozhametov, A. T.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Moduli and extremal metrics on nonorientable and twisted Riemannian manifolds</title>
      <pubDate>Tue, 24 Mar 2026 03:05:58 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4824</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4824</guid>
      <author>Tamrazov, P. M.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Tamrazov, P. M.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Asymptotic solution of one-dimensional spectral boundary-value problems with rapidly varying coefficients: The case of multiple spectra</title>
      <pubDate>Tue, 24 Mar 2026 03:05:58 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4825</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4825</guid>
      <author>Teplins’kyi, O. Yu.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Teplins’kyi, O. Yu.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Asymptotic properties of the norm of the extremum of a sequence of normal random functions</title>
      <pubDate>Tue, 24 Mar 2026 03:05:54 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4822</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4822</guid>
      <author>Matsak, I. K.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Matsak, I. K.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>On sufficient conditions for the technical stability of controlled processes with lumped parameters</title>
      <pubDate>Tue, 24 Mar 2026 03:05:53 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4821</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4821</guid>
      <author>Matviichuk, K. S.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Matviichuk, K. S.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Localization of the spectrum and representation of solutions of linear dynamical systems</title>
      <pubDate>Tue, 24 Mar 2026 03:05:52 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4820</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4820</guid>
      <author>Mazko, A. G.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Mazko, A. G.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Diametral theory of algebraic surfaces and geometric theory of invariants of groups generated by reflections. III</title>
      <pubDate>Tue, 24 Mar 2026 03:05:51 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4819</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4819</guid>
      <author>Ignatenko, V. F.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Ignatenko, V. F.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Explicit realization of irreducible representations of classical compact lie groups in the spaces of sections of line bundles</title>
      <pubDate>Tue, 24 Mar 2026 03:05:50 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4818</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4818</guid>
      <author>Golod, P. I.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Golod, P. I.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Estimates of generalized solutions of the Dirichlet problem for quasilinear elliptic equations of the second order in a domain with conical boundary point</title>
      <pubDate>Tue, 24 Mar 2026 03:05:48 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4816</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4816</guid>
      <author>Borsuk, M. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Borsuk, M. V.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Spherical means on Euclidean spaces</title>
      <pubDate>Tue, 24 Mar 2026 03:05:48 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4817</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4817</guid>
      <author>Volchkov, V. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Volchkov, V. V.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Numerical-analytic method for the investigation of multipoint boundary-value problems for systems of differential equations with transformed argument</title>
      <pubDate>Tue, 24 Mar 2026 03:05:46 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4815</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4815</guid>
      <author>Bigun, Ya. I.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Bigun, Ya. I.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Riquier problem for a nonlinear equation resolved with respect to the iterated Levi Laplacian</title>
      <pubDate>Tue, 24 Mar 2026 03:05:45 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4813</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4813</guid>
      <author>Feller, M. N.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Feller, M. N.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>On the London theorem concerning the Borel relation for entire functions</title>
      <pubDate>Tue, 24 Mar 2026 03:05:45 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4814</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4814</guid>
      <author>Filevych, P. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Filevych, P. V.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Hausdorff diameter of a nonsymmetric class of vector functions</title>
      <pubDate>Tue, 24 Mar 2026 03:05:43 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4812</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4812</guid>
      <author>Polovina, A. A.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Polovina, A. A.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Paley-Wiener-type theorem for nilpotent Lie groups</title>
      <pubDate>Tue, 24 Mar 2026 03:05:41 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4810</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4810</guid>
      <author>Kisil&amp;#039;, V. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Kisil&amp;#039;, V. V.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Stable solutions of a system of two connected Chua cells</title>
      <pubDate>Tue, 24 Mar 2026 03:05:41 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4811</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4811</guid>
      <author>Nizhnik, I. L.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Nizhnik, I. L.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Quotient groups of locally graded groups and groups of certain Kurosh-Chernikov classes</title>
      <pubDate>Tue, 24 Mar 2026 03:05:40 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4807</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4807</guid>
      <author>Trebenko, D. Ya.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Trebenko, D. Ya.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>A new class of compact spherical spaces</title>
      <pubDate>Tue, 24 Mar 2026 03:05:40 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4809</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4809</guid>
      <author>Dzyadyk, Yu. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Dzyadyk, Yu. V.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Linear periodic boundary-value problem for a second-order hyperbolic equation. I</title>
      <pubDate>Tue, 24 Mar 2026 03:05:39 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4806</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4806</guid>
      <author>Khoma, N. H.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Khoma, N. H.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Space-time localization in one-dimensional problems with free boundary for nonlinear second-order equations</title>
      <pubDate>Tue, 24 Mar 2026 03:05:39 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4808</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4808</guid>
      <author>Bittiev, Kh. R.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Bittiev, Kh. R.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>On the noncompactness of classes of mappings with restrictions on dilation in measure</title>
      <pubDate>Tue, 24 Mar 2026 03:05:38 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4804</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4804</guid>
      <author>Potemkin, V. L.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Potemkin, V. L.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Random oscillations in the Van der Pol system under the action of a broadband random process</title>
      <pubDate>Tue, 24 Mar 2026 03:05:37 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4803</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4803</guid>
      <author>Mitropolskiy, Yu. A.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Mitropolskiy, Yu. A.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Structure of locally graded CDN (]-groups</title>
      <pubDate>Tue, 24 Mar 2026 03:05:37 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4805</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4805</guid>
      <author>Semko, N. N.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Semko, N. N.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Approximation of solutions of operator-differential equations by operator polynomials</title>
      <pubDate>Tue, 24 Mar 2026 03:05:36 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4802</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4802</guid>
      <author>Kashpirovskii, A. I.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Kashpirovskii, A. I.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Properties of the fundamental solutions and uniqueness theorems for the solutions of the Cauchy problem for one class of ultraparabolic equations</title>
      <pubDate>Tue, 24 Mar 2026 03:05:35 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4800</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4800</guid>
      <author>Ivasyshen, S. D.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Ivasyshen, S. D.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Groups all proper quotient groups of which possess layer-Chernikov properties</title>
      <pubDate>Tue, 24 Mar 2026 03:05:35 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4801</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4801</guid>
      <author>Kalashnikova, N. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Kalashnikova, N. V.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>On the Levy-Baxter theorems for shot-noise fields. I</title>
      <pubDate>Tue, 24 Mar 2026 03:05:33 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4798</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4798</guid>
      <author>Buldygin, V. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Buldygin, V. V.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>On one proof of the classical solvability of the Hele-Shaw problem with free boundary</title>
      <pubDate>Tue, 24 Mar 2026 03:05:32 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4797</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4797</guid>
      <author>Bazalii, B. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Bazalii, B. V.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>The best $L_1$-approximations of classes of functions defined by differential operators in terms of generalized splines from these classes</title>
      <pubDate>Tue, 24 Mar 2026 03:05:31 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4796</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4796</guid>
      <author>Babenko, V. F.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Babenko, V. F.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Uniqueness theorems for multiple lacunary trigonometric series</title>
      <pubDate>Tue, 24 Mar 2026 03:05:30 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4799</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4799</guid>
      <author>Volchkov, V. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Volchkov, V. V.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Index of volume 50 of „Ukrainian Mathematical Journal&amp;quot;</title>
      <pubDate>Tue, 24 Mar 2026 03:05:25 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4795</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4795</guid>
      <author>EditorialBoard</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>EditorialBoard</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Random variables determined by the distributions of their digits in a numeration system with complex base</title>
      <pubDate>Tue, 24 Mar 2026 03:05:22 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4793</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4793</guid>
      <author>O., V. Shkol’nyi</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>O., V. Shkol’nyi</dc:creator>
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    <item>
      <title>Vladislav Kirillovich Dzyadyk</title>
      <pubDate>Tue, 24 Mar 2026 03:05:22 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4794</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4794</guid>
      <author>EditorialBoard</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>EditorialBoard</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Analyticity of a free boundary in one problem of axisymmetric flow</title>
      <pubDate>Tue, 24 Mar 2026 03:05:20 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4789</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4789</guid>
      <author>Minenko, A. S.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
      <dc:creator>Minenko, A. S.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Filtration of components of processes of random evolution</title>
      <pubDate>Tue, 24 Mar 2026 03:05:20 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4790</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4790</guid>
      <author>Lukin, A. E.</author>
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      <title>On samples of independent random vectors in spaces of infinitely increasing dimension</title>
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      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4791</link>
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      <author>Ruzhilo, M. Ya</author>
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      <title>Solutions of systems of nonlinear difference equations that are continuous and bounded on the entire real axis and their properties</title>
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      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4783</link>
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      <title>Irresolvable topologies on groups</title>
      <pubDate>Tue, 24 Mar 2026 03:05:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4784</link>
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      <author>Protasov, I. V.</author>
      <dc:format>Article</dc:format>
      <dc:date>1998</dc:date>
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      <title>On a criterion of $NP$-completeness</title>
      <pubDate>Tue, 24 Mar 2026 03:05:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4788</link>
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      <title>Criteria for the coincidence of the kernel of a function with the kernels of its Riesz and Abel integral means</title>
      <pubDate>Tue, 24 Mar 2026 03:05:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4792</link>
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      <title>Linear periodic boundary-value problem for a second-order hyperbolic equation. II. Quasilinear problem</title>
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      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4787</link>
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      <author>Khoma, N. H.</author>
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      <title>The theory of the numerical-analytic method: Achievements and new trends of development. IV</title>
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      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4785</link>
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      <title>Perturbed Lamé equation and the Buslaev phase</title>
      <pubDate>Tue, 24 Mar 2026 03:05:16 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4786</link>
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      <author>Tajima, S.</author>
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      <title>On elements of the Lax-Phillips scattering scheme for $ρ$-perturbations of an abstract wave equation</title>
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      <title>Strong summability of multiple Fourier series and Sidon-type inequalities</title>
      <pubDate>Tue, 24 Mar 2026 03:05:11 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4782</link>
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      <title>Generalized and classical almost periodic solutions of Lagrangian systems convex on a compact set</title>
      <pubDate>Tue, 24 Mar 2026 03:05:09 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-4779</link>
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      <title>Random integral manifolds of systems of differential equations with unbounded operator in a Banach space</title>
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      <title>On differentiability of open mappings</title>
      <pubDate>Tue, 24 Mar 2026 03:05:07 +0000</pubDate>
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      <title>Index of volume 51 of „Ukrainian Mathematical Journal&amp;quot;</title>
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      <author>EditorialBoard</author>
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