共 50 条
- [34] Quadratic systems with maximum number of limit cycles Differential Equations, 2009, 45 : 1440 - 1450
- [37] QUADRATIC VECTOR-FIELDS IN THE PLANE HAVE A FINITE NUMBER OF LIMIT-CYCLES PUBLICATIONS MATHEMATIQUES, 1986, (64): : 111 - 142
- [40] A SUFFICIENT CONDITION FOR THE EXISTENCE OF LIMIT-CYCLES OF CLASS(II) OF QUADRATIC SYSTEMS KEXUE TONGBAO, 1983, 28 (08): : 1139 - 1139