Ordinary Differential Equations

Nonzero Periodic Solutions of Nonlinear Systems of Ordinary Differential Equations with a Singular Matrix Multiplying the Derivatives

M. T. Teryokhin

Ryazan State Pedagogical University

UDC: 517.925.52

Received: 22.02.2001

 English version: Differential Equations, 2003, 39:12, 1732–1740

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