On the periodic solutions of the second-order wave equations. V
English version (Springer): Ukrainian Mathematical Journal 45 (1993), no. 8, pp 1244-1251.
Citation Example: Khoma G. P., Mitropolskiy Yu. A. On the periodic solutions of the second-order wave equations. V // Ukr. Mat. Zh. - 1993. - 45, № 8. - pp. 1115–1121.
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