@article{1183425068,
author = {Bell, E. T.},
title = {On the number of representations of $2n$ as a sum of $2r$ squares},
journal = {Bull. Amer. Math. Soc.},
volume = {26},
number = {3},
year = {1919},
pages = { 19-25},
language = {en},
url = {http://dml.mathdoc.fr/item/1183425068}
}
Bell, E. T. On the number of representations of $2n$ as a sum of $2r$ squares. Bull. Amer. Math. Soc., Tome 26 (1919) no. 3, pp. 19-25. http://gdmltest.u-ga.fr/item/1183425068/