@article{PORMA_1956__15_3_114772,
     author = {Stolt, B.},
     title = {A note on triangular numbers},
     journal = {Portugaliae mathematica},
     pages = {87--88},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1956},
     mrnumber = {0084516},
     zbl = {0077.26301},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1956__15_3_114772/}
}