@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/