共 50 条
- [2] ON THE NUMBER OF LIMIT-CYCLES IN QUADRATIC SYSTEMS [J]. VESTNIK LENINGRADSKOGO UNIVERSITETA SERIYA MATEMATIKA MEKHANIKA ASTRONOMIYA, 1987, (02): : 129 - 130
- [3] LIMIT-CYCLES OF PERTURBATIONS OF QUADRATIC HAMILTONIAN VECTOR-FIELDS [J]. JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES, 1993, 72 (02): : 213 - 238
- [4] LIMIT-CYCLES OF QUADRATIC SYSTEMS [J]. COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1980, 291 (05): : 337 - 340
- [9] Limit cycles under perturbations of a quadratic Hamiltonian system [J]. Differential Equations, 2012, 48 : 693 - 700