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@article{EXMA_1995__4_2_226090, author = {Guckenheimer, John}, title = {Phase portraits of planar vector fields: {Computer} proofs.}, journal = {Experimental mathematics}, pages = {153--165}, publisher = {mathdoc}, volume = {4}, number = {2}, year = {1995}, zbl = {0856.34045}, language = {en}, url = {http://geodesic.mathdoc.fr/item/EXMA_1995__4_2_226090/} }
Guckenheimer, John. Phase portraits of planar vector fields: Computer proofs.. Experimental mathematics, Tome 4 (1995) no. 2, pp. 153-165. http://geodesic.mathdoc.fr/item/EXMA_1995__4_2_226090/