On some generalizations of pronormal subgroups by O. O. Pypka

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On the relationships between the central series in some locally finite groups by O. O. Pypka

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On some relationships between the generalized central series of Leibniz algebras by O. O. Pypka

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On some types of propermutable subgroups and their generalizations in finite groups by O. O. Pypka, Yu. Storozhenko

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On the automorphism groups for some Leibniz algebras of low dimensions by L. A. Kurdachenko, O. O. Pypka, T. V. Velychko

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The description of the automorphism groups of finitedimensional cyclic Leibniz algebras by L. A. Kurdachenko, O. O. Pypka, Ya. Subbotin

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On Leibniz algebras whose subalgebras are either ideals or self-idealizing by L. A. Kurdachenko, O. O. Pypka, Ya. Subbotin

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On some relationships between the factors of the canonical central series of Leibniz algebras by L. A. Kurdachenko, Kh. Otal, O. O. Pypka

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On some properties of the central and generalized central series of groups by L. A. Kurdachenko, Kh. Otal, O. O. Pypka

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On some reciprocal relations between the factors of the upper and lower central series in Lie algebras by L. A. Kurdachenko, O. O. Pypka, Ya. Subbotin

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Periodic groups, whose cyclic subgroups either are ascendant or almost self-normalized by L. A. Kurdachenko, O. O. Pypka, M. M. Semko

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On some analogues of theorems of Schur and Baer by M. R. Dikson, L. A. Kurdachenko, O. O. Pypka

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