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@article{PORMA_1957__16_1_114779, author = {Stolt, B.}, title = {A theorem on triangular numbers}, journal = {Portugaliae mathematica}, pages = {3--5}, publisher = {mathdoc}, volume = {16}, number = {1}, year = {1957}, mrnumber = {0099955}, zbl = {0081.27201}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1957__16_1_114779/} }
Stolt, B. A theorem on triangular numbers. Portugaliae mathematica, Tome 16 (1957) no. 1, pp. 3-5. http://geodesic.mathdoc.fr/item/PORMA_1957__16_1_114779/