| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 470188 | Computers & Mathematics with Applications | 2006 | 12 Pages |
Abstract
We obtain necessary and sufficient coefficient conditions for a center at the origin for a Liénard system with nonlinearities of degree six. The necessity of the conditions is derived from the first seven focus quantities and their sufficiency is proved by Cherkas's method.
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