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144 p, 1.4 MB Bifurcations of limit cycles in planar differential and piecewise differential systems / Pereira Costa da Cruz, Leonardo, autor. ; Torregrosa Arús, Joan, supervisor acadèmic. ; Universitat Autònoma de Barcelona. Departament de Matemàtiques.
nd $, the inner and outer Abelian integrals are rational functions and we provide an upper bound for the number of simple zeros. The maximum number of limit cycles, up to first order cubic perturbation, from the inner and outer annuli is 9 and 8, respectively. [...]
[Barcelona] : Universitat Autònoma de Barcelona, 2019.  

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