%0 Journal Article %A Roman Ger %T On some functional equations with a restricted domain %J Fundamenta Mathematicae %D 1975 %P 131-149 %V 89 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-89-2-131-149/ %R 10.4064/fm-89-2-131-149 %G en %F 10_4064_fm_89_2_131_149