@article{GDZPPN001167111,
title = {On Sign Determinations in Real Algebraic Number Fields.},
journal = {Numerische Mathematik},
volume = {11},
year = {1968},
pages = {170-174},
zbl = {0211.46804},
url = {http://dml.mathdoc.fr/item/GDZPPN001167111}
}
KEMPFERT, H. On Sign Determinations in Real Algebraic Number Fields.. Numerische Mathematik, Tome 11 (1968) pp. 170-174. http://gdmltest.u-ga.fr/item/GDZPPN001167111/