@article{GDZPPN00036374X, title = {A Sylvester Theorem for Conic Sections.}, journal = {Discrete \& computational geometry}, volume = {3}, year = {1988}, pages = {295-306}, zbl = {0643.51009}, url = {http://dml.mathdoc.fr/item/GDZPPN00036374X} }
Wiseman, J.A.; Wilson, Paul R. A Sylvester Theorem for Conic Sections.. Discrete & computational geometry, Tome 3 (1988) pp. 295-306. http://gdmltest.u-ga.fr/item/GDZPPN00036374X/