@article{GDZPPN002192055,
title = {Units with norm - 1 and signatures of units.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {281},
year = {1976},
pages = {164-175},
zbl = {0355.12004},
url = {http://dml.mathdoc.fr/item/GDZPPN002192055}
}
Garbanati, Dennis A. Units with norm - 1 and signatures of units.. Journal für die reine und angewandte Mathematik, Tome 281 (1976) pp. 164-175. http://gdmltest.u-ga.fr/item/GDZPPN002192055/