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Existence of inverse integrating factors and Lie symmetries for degenerate planar centers |
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| Authors: | Jaume Giné Daniel Peralta-Salas |
| Affiliation: | 1. Departament de Matemàtica, Universitat de Lleida, Avda. Jaume II 69, 25001 Lleida, Catalonia, Spain;2. Instituto de Ciencias Matemáticas, CSIC-UAM-UC3M-UCM, C/Nicolás Cabrera 13–15, Campus de Cantoblanco, 28049 Madrid, Spain |
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