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Head: Drozd Yurii A.. Investigation of dynamical systems and evolution processes by topological, stochastic and algebraic methods. (popup.stage: ). Institute of Mathematics of the National Academy of Sciences of Ukraine. № 0222U001211

Polulyakh Yevgen . Topology of singular foliations on surfaces and related questions : Доктор фізико-математичних наук : spec.. - : presented. 2018-05-15; popup.evolution: .; The Institute of Mathematics of NASU. – Київ, 0518U000520.

Polulyakh Yevgen Oleksandrovych. Certain topological properties of Pontryagin dynamical systems : к.ф.-м.н. : spec.. 01.01.02 - Диференційні рівняння : presented. 1999-12-21; popup.evolution: .; Institute of mathematics NAS of Ukraine. – , 0400U000075.