@article{GDZPPN002261154, title = {Associate Surfaces}, journal = {Mathematische Annalen}, volume = {62}, year = {1906}, pages = {504-538}, zbl = {37.0637.03}, url = {http://dml.mathdoc.fr/item/GDZPPN002261154} }
Eisenhart, L.P. Associate Surfaces. Mathematische Annalen, Tome 62 (1906) pp. 504-538. http://gdmltest.u-ga.fr/item/GDZPPN002261154/