Limit cycles and Lie symmetries

Bulletin des Sciences Mathématiques - Tập 131 - Trang 501-517 - 2007
Emilio Freire1, Armengol Gasull2, Antoni Guillamon3
1E. S. Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos s.n., 41092 Sevilla, Spain
2Departamento de Matemàtiques, Edifici Cc, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
3Departamento de Matemàtica Aplicada I, Universitat Politècnica de Catalunya, Dr. Marañón n. 44-50, 08028 Barcelona, Spain

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