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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 33, No. 6, pp. 779–786, November–December, 1981.
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Khoma, G.P. Discovery of periodic solutions of nonlinear first-order systems with distributed parameters. Ukr Math J 33, 587–593 (1981). https://doi.org/10.1007/BF01085434
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DOI: https://doi.org/10.1007/BF01085434