An extension of Dragilev’s theorem for the existence of periodic solutions of the Liénard equation
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1993 ◽
Vol 113
(2)
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pp. 413-422
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1966 ◽
Vol 13
(4)
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pp. 419-423
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1998 ◽
Vol 174
(1)
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pp. 277-284
2008 ◽
Vol 219
(1)
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pp. 263-275
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2019 ◽
Vol 45
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pp. 542-556
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