%0 Journal Article %A Franz Halter-Koch %A Philip Leonard %T Negatively reduced ideals in orders of real quadratic fields: even discriminants %J Colloquium Mathematicum %D 1996 %P 147-153 %V 69 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-69-1-147-153/ %R 10.4064/cm-69-1-147-153 %G en %F 10_4064_cm_69_1_147_153