On limit cycles of two-dimensional analytic flows

MR0621539 Gonz{\'a}lez-Velasco, Enrique A. Enrique A. GONZÁLEZ-VELASCO On limit cycles of two-dimensional analytic flows Fako de l'Funkcialaj Ekvacioj Japana Matematika Societo. Funkcialaj Ekvaciog. Serio Internacia 23 1980 351--355 http://fe.math.kobe-u.ac.jp/FE/Free/vol23/fe23-3-8.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe23-351-355/fe23-351-355.pdf http://www.ams.org/mathscinet-getitem?mr=MR0621539 fe23-351-355 1980 On Limit Cycles of Two-Dimensional Analytic Flows GONZ\'{A}LEZ-VELASCO, Enrique A. GONZ\'{A}LEZ-VELASCO, Enrique A.

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