%0 Journal Article %A Franz Halter-Koch %T Factorization problems in class number two %J Colloquium Mathematicum %D 1993 %P 255-265 %V 65 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-65-2-255-265/ %R 10.4064/cm-65-2-255-265 %G en %F 10_4064_cm_65_2_255_265