On the groups, whose all subgroups with infinite special rank are transitively normal by M. M. Semko, T. V. Velychko

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About the structure of finite groups, whose all non-Abelian subgroups are subnormal by L. A. Kurdachenko, M. M. Semko, S. Atlikhan

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On the derivations of Leibniz algebras of low dimension by L. A. Kurdachenko, M. M. Semko, V. S. Yashchuk

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Leibniz algebras, whose all subalgebras are ideals by L. A. Kurdachenko, M. M. Semko, Ya. Subbotin

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On the structure of groups whose non-abelia subgroups are serial by M. R. Dikson, L. A. Kurdachenko, M. M. Semko

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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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