共 50 条
- [22] QUADRATIC VECTOR-FIELDS IN THE PLANE HAVE A FINITE NUMBER OF LIMIT-CYCLES PUBLICATIONS MATHEMATIQUES, 1986, (64): : 111 - 142
- [28] BIFURCATION OF EQUIVARIANT VECTOR-FIELDS ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS, 1983, 55 (02): : 151 - 154