@article{EJDE_2000__2000__a208,
     author = {Boularas, D.},
     title = {A note on the saddle conic of quadratic planar differential systems},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2000},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a208/}
}