@article{GDZPPN002276690, title = {The representation of integers as sums of pyramidal numbers .}, journal = {Mathematische Annalen}, volume = {109}, year = {1934}, pages = {196-199}, zbl = {0008.14704}, url = {http://dml.mathdoc.fr/item/GDZPPN002276690} }
James, R.D. The representation of integers as sums of pyramidal numbers .. Mathematische Annalen, Tome 109 (1934) pp. 196-199. http://gdmltest.u-ga.fr/item/GDZPPN002276690/