@article{MAN_1934__109_159674,
     author = {R.D. James},
     title = {The representation of integers as sums of pyramidal numbers .},
     journal = {Mathematische Annalen},
     pages = {196--199},
     publisher = {mathdoc},
     volume = {109},
     year = {1934},
     zbl = {0008.14704},
     url = {http://geodesic.mathdoc.fr/item/MAN_1934__109_159674/}
}