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Original Russian Text © A.A. Grin’, 2006, published in Differentsial’nye Uravneniya, 2006, Vol. 42, No. 6, pp. 840–843.
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Grin’, A.A. Reduction to transversality of curves in the construction of a Dulac function. Diff Equat 42, 896–900 (2006). https://doi.org/10.1134/S0012266106060139
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DOI: https://doi.org/10.1134/S0012266106060139