Izv. Vyssh. Uchebn. Zaved. Mat., 1991 Number 1, Pages 11–14
(Mi ivm4941)
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Periodic solutions of perturbed differential equations
E. V. Voskresenskii Saransk
UDC:
517.93 Received: 27.02.1989
English version:
Soviet Mathematics (Izvestiya VUZ. Matematika), 1991,
35:1,
12–15
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