Llibre, Jaume; Valls, Clàudia. «On the uniqueness of algebraic limit cycles for quadratic polynomial differential systems with two pairs of equilibrium points at infinity». Geometriae Dedicata, Vol. 191 (2017), p. 37-52. DOI 10.1007/s10711-017-0244-y <https://ddd.uab.cat/record/182533> [Consulta: 12 abril 2025].

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