共 50 条
- [4] QUADRATIC VECTOR-FIELDS IN THE PLANE HAVE A FINITE NUMBER OF LIMIT-CYCLES [J]. PUBLICATIONS MATHEMATIQUES, 1986, (64): : 111 - 142
- [5] LIMIT-CYCLES OF PERTURBATIONS OF QUADRATIC HAMILTONIAN VECTOR-FIELDS [J]. JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES, 1993, 72 (02): : 213 - 238
- [7] Algebraical Limit Cycles of Polynomial Vector Fields on the Plane [J]. Differential Equations, 2001, 37 : 1211 - 1216