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- [3] ON LIMIT-CYCLES OF PLANAR QUADRATIC SYSTEM [J]. SCIENTIA SINICA SERIES A-MATHEMATICAL PHYSICAL ASTRONOMICAL & TECHNICAL SCIENCES, 1983, 26 (10): : 1025 - 1033
- [4] ON LIMIT-CYCLES OF PLANAR QUADRATIC SYSTEM [J]. SCIENTIA SINICA SERIES A-MATHEMATICAL PHYSICAL ASTRONOMICAL & TECHNICAL SCIENCES, 1982, 25 (01): : 41 - 50
- [7] LIMIT-CYCLES CLOSE TO INFINITY OF CERTAIN NONLINEAR DIFFERENTIAL-EQUATIONS [J]. CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 1990, 33 (01): : 55 - 59