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Terekhin, M.T. Nonzero Periodic Solutions of Nonlinear Systems of Ordinary Differential Equations with a Singular Matrix Multiplying the Derivatives. Differential Equations 39, 1732–1740 (2003). https://doi.org/10.1023/B:DIEQ.0000023553.67453.55
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DOI: https://doi.org/10.1023/B:DIEQ.0000023553.67453.55