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zbMath0634.34023MaRDI QIDQ3772544

Publication date: 1987

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

zbMATH Keywords

existence of multiple periodic orbits

Mathematics Subject Classification ID

Periodic solutions to ordinary differential equations (34C25) Nonlinear ordinary differential equations and systems (34A34)

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Limit cycles and center-focus of nonlinear systems

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