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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 25, No. 3, pp. 198–203, May–June, 1984.
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Khovanskii, A.G. Cycles of dynamical systems on the plane and Rolle's theorem. Sib Math J 25, 502–506 (1984). https://doi.org/10.1007/BF00968990
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DOI: https://doi.org/10.1007/BF00968990