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zbMath0746.34023MaRDI QIDQ4004553

Pingguang Zhang

Publication date: 27 September 1992

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

zbMATH Keywords

center focus limit cycle existence and uniqueness ecological system sufficient and necessary conditions

Mathematics Subject Classification ID

Topological structure of integral curves, singular points, limit cycles of ordinary differential equations (34C05) Ecology (92D40)

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