Spectral properties of partial automorphisms of a binary rooted tree von Kochubinska, E.

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Abelian doppelsemigroups von Zhuchok, A.V., Knauer, K.

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Volodymyr Kyrychenko (to the 75th anniversary)

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On hereditary reducibility of 2-monomial matrices over commutative rings von Bondarenko, V.M., Gildea, J., Tylyshchak, A.A., Yurchenko, N.V.

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On indices and eigenvectors of quivers von Dudchenko, I., Plakhotnyk, M.

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Generalized classes of suborbital graphs for the congruence subgroups of the modular group von Jaipong, P., Tapanyo, W.

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The lattice of quasivarietes of modules over a Dedekind ring von Jedlička, P., Matczak, K., Mućka, A.

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On the number of topologies on a finite set von Kizmaz, M.Y.

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Conjugacy in finite state wreath powers of finite permutation groups von Oliynyk, A., Russyev, A.

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On free vector balleans von Protasov, I., Protasova, K.

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Classification of homogeneous Fourier matrices von Singh, G.

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A Ramsey algebraic study of matrices von Teoh, Z.Y., Teh, W.C.

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On certain families of sparse numerical semigroups with Frobenius number even von Tizziotti, G., Villanueva, J.

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Planarity of a spanning subgraph of the intersection graph of ideals of a commutative ring II, Quasilocal Case von Visweswaran, S., Vadhel, P.

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Representations of ordered doppelsemigroups by binary relations von Zhuchok, Y.V., Koppitz, J.

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Volodymyr Kyrychenko (17.06.1942 - 02.04.2019)

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A family of doubly stochastic matrices involving Chebyshev polynomials von Ahmed, T., Caballero, J.M.R.

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Automorphism groups of superextensions of finite monogenic semigroups von Banakh, T.O., Gavrylkiv, V.M.

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On cospectral signed digraphs von Bhat, M.A., Naikoo, T.A., Pirzada, S.

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The classification of serial posets with the non-negative quadratic Tits form being principal von Bondarenko, V.M., Styopochkina, M.V.

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