@article{GDZPPN002244977, title = {Ueber singul\"are Tangenten algebraischer Fl\"achen}, journal = {Mathematische Annalen}, volume = {15}, year = {1879}, pages = {211-237}, zbl = {11.0468.01}, url = {http://dml.mathdoc.fr/item/GDZPPN002244977} }
Krey. Ueber singuläre Tangenten algebraischer Flächen. Mathematische Annalen, Tome 15 (1879) pp. 211-237. http://gdmltest.u-ga.fr/item/GDZPPN002244977/