@article{NUMA_1968__11_131817,
     author = {H. KEMPFERT},
     title = {On {Sign} {Determinations} in {Real} {Algebraic} {Number} {Fields.}},
     journal = {Numerische Mathematik},
     pages = {170--174},
     publisher = {mathdoc},
     volume = {11},
     year = {1968},
     zbl = {0211.46804},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1968__11_131817/}
}