@article{2967,
author = {Hardy, J.T.},
title = {Sums of three squares in certain Cayley rings},
journal = {Portugaliae mathematica},
volume = {40},
year = {1981},
pages = {313-323},
zbl = {0576.10016},
mrnumber = {0819897},
language = {en},
url = {http://dml.mathdoc.fr/item/2967}
}
Hardy, J.T. Sums of three squares in certain Cayley rings. Portugaliae mathematica, Tome 40 (1981) pp. 313-323. http://gdmltest.u-ga.fr/item/2967/