@article{1183415039, author = {Stabler, Edward L.}, title = {Triangular numbers}, journal = {Bull. Amer. Math. Soc.}, volume = {4}, number = {3}, year = {1897}, pages = { 399-401}, language = {en}, url = {http://dml.mathdoc.fr/item/1183415039} }
Stabler, Edward L. Triangular numbers. Bull. Amer. Math. Soc., Tome 4 (1897) no. 3, pp. 399-401. http://gdmltest.u-ga.fr/item/1183415039/