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zbMath0436.34038MaRDI QIDQ3876262

Eh. F. Kirnitskaya, K. S. Sibirskij

Publication date: 1978

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

centers quadratic differential system

Mathematics Subject Classification ID

Periodic solutions to ordinary differential equations (34C25) Nonlinear ordinary differential equations and systems (34A34) Qualitative theory for ordinary differential equations (34C99)

Related Items (1)

Phase portraits of separable quadratic systems and a bibliographical survey on quadratic systems

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