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Original Russian Text © O.A. Lobanova, B.N. Sadovskii, 2007, published in Differentsial’nye Uravneniya, 2007, Vol. 43, No. 4, pp. 449–456.
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Lobanova, O.A., Sadovskii, B.N. On two-dimensional dynamical systems with a constraint. Diff Equat 43, 460–468 (2007). https://doi.org/10.1134/S0012266107040039
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DOI: https://doi.org/10.1134/S0012266107040039