@article{01570671,
title = {Recursive determination of the enumerator for sums of three squares.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {23},
year = {2000},
pages = {529-532},
doi = {10.1155/S0161171200003902},
zbl = {1043.11037},
language = {en},
url = {http://dml.mathdoc.fr/item/01570671}
}
Ewell, John A. Recursive determination of the enumerator for sums of three squares.. International Journal of Mathematics and Mathematical Sciences, Tome 23 (2000) pp. 529-532. doi : 10.1155/S0161171200003902. http://gdmltest.u-ga.fr/item/01570671/