@article{1183506630, author = {Chang, Su-Cheng}, title = {On the quadrics associated with a point of a surface}, journal = {Bull. Amer. Math. Soc.}, volume = {50}, number = {12}, year = {1944}, pages = { 926-930}, language = {en}, url = {http://dml.mathdoc.fr/item/1183506630} }
Chang, Su-Cheng. On the quadrics associated with a point of a surface. Bull. Amer. Math. Soc., Tome 50 (1944) no. 12, pp. 926-930. http://gdmltest.u-ga.fr/item/1183506630/