Advances in Differential Equations and Control Processes
Volume 6, Issue 1, Pages 15 - 24
(August 2010)
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A NOTE ON LIÉNARD SYSTEMS WITH INVARIANT ALGEBRAIC CURVES
Makoto Hayashi
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and
it shall be
concluded that if a Liénard system
has an invariant algebraic curve, then it must have an invariant curve of
the form