%0 Journal Article %A Olga Taussky %T Norms in Quadratic Fields and Their Relations to Non Commuting 2x2 Matrices I. %J Monatshefte für Mathematik %D 1976 %P 253-256 %V 82 %I mathdoc %U http://geodesic.mathdoc.fr/item/MOMA_1976__82_177782/ %F MOMA_1976__82_177782