DOI10.1007/BF01097031zbMath0699.34031MaRDI QIDQ913070
N. B. Medvedeva
Publication date: 1988 Published in: Journal of Soviet Mathematics (Search for Journal in Brave)
zbMATH Keywords
vortexcentrestrongly degenerate singularity
Mathematics Subject Classification ID
Topological structure of integral curves, singular points, limit cycles of ordinary differential equations (34C05)
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