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JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive
Izv. Vyssh. Uchebn. Zaved. Mat., 1961 Number 6, Pages 82–88 (Mi ivm1937)
Some problems in the qualitative study of differential equations in the plane

N. V. Medvedev

Kazan State Pedagogical University

Received: 07.04.1959



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