@article{GDZPPN002197391,
title = {On the Pythagoras number of orders in totally real number fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {316},
year = {1980},
pages = {208-210},
zbl = {0421.12017},
url = {http://dml.mathdoc.fr/item/GDZPPN002197391}
}
Scharlau, Rudolf. On the Pythagoras number of orders in totally real number fields.. Journal für die reine und angewandte Mathematik, Tome 316 (1980) pp. 208-210. http://gdmltest.u-ga.fr/item/GDZPPN002197391/