@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa102-2-2,
author = {Meinhard Peters},
title = {Sums of nine squares},
journal = {Acta Arithmetica},
volume = {102},
year = {2002},
pages = {131-135},
zbl = {1005.11012},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa102-2-2}
}
Meinhard Peters. Sums of nine squares. Acta Arithmetica, Tome 102 (2002) pp. 131-135. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa102-2-2/