Liouvillian and Analytic Integrability of the Quadratic Vector Fields Having an Invariant Ellipse
Jaume LLIBRE, Claudia VALLS
Acta Mathematica Sinica ›› 2014, Vol. 30 ›› Issue (3) : 453-466.
Liouvillian and Analytic Integrability of the Quadratic Vector Fields Having an Invariant Ellipse
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