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Share Give access Share full text access. Share full text access. Please review our Terms and Conditions of Use and check box below to share full-text version of article. Volume 68 , Issue 12 Pages Related Information. Coppel , A survey of quadratic systems , J. Differential Equations 2 , — Differential Equations 23 , no. Dumortier , R. Roussarie , and J. Sotomayor , Generic 3-parameter families of vector fields on the plane, unfolding a singularity with nilpotent linear part.
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