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Bibliography
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Schlomiuk, D. (1990). Algebraic integrals of quadratic systems with a weak focus. In: Françoise, JP., Roussarie, R. (eds) Bifurcations of Planar Vector Fields. Lecture Notes in Mathematics, vol 1455. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0085402
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DOI: https://doi.org/10.1007/BFb0085402
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