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Additional information
Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 18, No. 3, pp. 32–42, July–September, 1984.
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Il'yashenko, Y.S. Limit cycles of polynomial vector fields with nondegenerate singular points on the real plane. Funct Anal Its Appl 18, 199–209 (1984). https://doi.org/10.1007/BF01086157
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DOI: https://doi.org/10.1007/BF01086157