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- [5] ON CONDITIONS FOR EXISTENCE OF THE LIMIT-CYCLES OF LIENARD EQUATION KEXUE TONGBAO, 1982, 27 (11): : 1139 - 1142
- [7] LIMIT-CYCLES OF LIENARD EQUATIONS WITH NONLINEAR DAMPING CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 1993, 36 (02): : 251 - 256
- [10] 2 THEOREMS ON EXISTENCE OF LIMIT-CYCLES OF THE LIENARD EQUATION KEXUE TONGBAO, 1982, 27 (03): : 344 - 345