Periodic solutions of a countable system of differential equations with deviating neutral argument
English version (Springer): Ukrainian Mathematical Journal 21 (1969), no. 1, pp 58-67.
Citation Example: Tkach B. P. Periodic solutions of a countable system of differential equations with deviating neutral argument // Ukr. Mat. Zh. - 1969. - 21, № 1. - pp. 73–85.
Full text