@article{1183407790, author = {Halsted, George Bruce}, title = {Lambert's non-euclidean geometry}, journal = {Bull. New York Math. Soc.}, volume = {2}, number = {4}, year = {1893}, pages = { 79-80}, language = {en}, url = {http://dml.mathdoc.fr/item/1183407790} }
Halsted, George Bruce. Lambert's non-euclidean geometry. Bull. New York Math. Soc., Tome 2 (1893) no. 4, pp. 79-80. http://gdmltest.u-ga.fr/item/1183407790/