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Publication:3828314
zbMath0674.34025MaRDI QIDQ3828314
Nicolae Vulpe, K. S. Sibirskij
Publication date: 1989
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Periodic solutions to ordinary differential equations (34C25) Topological structure of integral curves, singular points, limit cycles of ordinary differential equations (34C05) Nonlinear oscillations and coupled oscillators for ordinary differential equations (34C15)
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