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Nonzero periodic solutions of a special system of nonlinear differential equations. (English. Russian original) Zbl 1452.34047

J. Math. Sci., New York 248, No. 4, 467-475 (2020); translation from Itogi Nauki Tekh., Ser. Sovrem. Mat. Prilozh., Temat. Obz. 148, 93-100 (2018).
MSC:  34C25 37C60 47N20
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