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- [5] THEOREM OF EXISTENCE OF EXACT N-LIMIT CYCLES FOR LIENARD EQUATION SCIENTIA SINICA SERIES A-MATHEMATICAL PHYSICAL ASTRONOMICAL & TECHNICAL SCIENCES, 1983, 26 (05): : 449 - 459
- [9] Limit cycles of the lienard equation with discontinuous coefficients Doklady Physics, 2009, 54 : 238 - 241