Llibre, Jaume; Oliveira, Regilene; Rodrigues, Camila A. B. «Quadratic systems with an invariant algebraic curve of degree 3 and a Darboux invariant». Electronic journal of differential equations, Vol. 2021, Issue 69 (2021), p. 1-52. <https://ddd.uab.cat/record/258883> [Consulta: 8 abril 2025].

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