@article{01295498, title = {One property of triangular numbers.}, journal = {Portugaliae Mathematica. Nova S\'erie}, volume = {55}, year = {1998}, pages = {381-383}, zbl = {0926.11007}, language = {en}, url = {http://dml.mathdoc.fr/item/01295498} }
Deshpande, M.N. One property of triangular numbers.. Portugaliae Mathematica. Nova Série, Tome 55 (1998) pp. 381-383. http://gdmltest.u-ga.fr/item/01295498/