MR1285486
Sakata, Sadahisa
Sadahisa SAKATA
On the existence of periodic solutions of a Li\'enard system
Funkcialaj Ekvacioj. Serio Internacia
37
1994
155--174
http://fe.math.kobe-u.ac.jp/FE/Free/vol37/fe37-1-9.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe37-155-174/fe37-155-174.pdf
http://www.ams.org/mathscinet-getitem?mr=MR1285486
fe37-155-174
1994
On the Existence of Periodic Solutions of a Liénard System
SAKATA, Sadahisa
SAKATA, Sadahisa
1
Comstock, C.
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On the existence of periodic solutions for Liénard equation
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