MR1418722 Odani, Kenzi Kenzi ODANI Existence of exactly {$N$} periodic solutions for Li\'enard systems Funkcialaj Ekvacioj. Serio Internacia 39 1996 217--234 http://fe.math.kobe-u.ac.jp/FE/Free/vol39/fe39-2-3.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe39-217-234/fe39-217-234.pdf http://www.ams.org/mathscinet-getitem?mr=MR1418722 fe39-217-234 1996 Existence of Exactly $N$ Periodic Solutions for Liénard Systems ODANI, Kenzi ODANI, Kenzi
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