Periodic solutions of nonlinear autonomous systems with delay
English version (Springer): Ukrainian Mathematical Journal 39 (1987), no. 1, pp 52-55.
Citation Example: Martynjuk, Martynyuk D. I. Periodic solutions of nonlinear autonomous systems with delay // Ukr. Mat. Zh. - 1987. - 39, № 1. - pp. 64–68.
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