Geodesic
Classification of quadratic systems with a~symmetry center and simple infinite singular points
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2003), pp. 102-119

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We classify the family of planar quadratic differential systems with a center of symmetry and two invariant straight lines according to the topology of their phase portraits. The case of the existence of simple infinite singular points is only considered. For each of the obtained distinct topological classes we give necessary and sufficient conditions in terms of algebraic invariants and comitants. The program was implemented for computer calculations. 
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     title = {Classification of quadratic systems with a~symmetry center and simple infinite singular points},
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Mircea Lupan; Nicolae Vulpe. Classification of quadratic systems with a~symmetry center and simple infinite singular points. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2003), pp. 102-119. http://geodesic.mathdoc.fr/item/BASM_2003_1_a10/