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Original Russian Text © V.V. Amel’kin, 2007, published in Differentsial’nye Uravneniya, 2007, Vol. 43, No. 10, pp. 1427–1429.
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Amel’kin, V.V. On the order of strong isochronicity of plane dynamical systems. Diff Equat 43, 1464–1467 (2007). https://doi.org/10.1134/S0012266107100151
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DOI: https://doi.org/10.1134/S0012266107100151