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Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 18, No. 2, 14–25, April–June, 1984.
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Varchenko, A.N. Estimate of the number of zeros of an abelian integral depending on a parameter and limit cycles. Funct Anal Its Appl 18, 98–108 (1984). https://doi.org/10.1007/BF01077820
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DOI: https://doi.org/10.1007/BF01077820