@article{1250126543, author = {Ewell, John E.}, title = {On sums of sixteen squares}, journal = {Rocky Mountain J. Math.}, volume = {17}, number = {4}, year = {1987}, pages = { 295-300}, language = {en}, url = {http://dml.mathdoc.fr/item/1250126543} }
Ewell, John E. On sums of sixteen squares. Rocky Mountain J. Math., Tome 17 (1987) no. 4, pp. 295-300. http://gdmltest.u-ga.fr/item/1250126543/