%0 Journal Article %A Zsolt Páles %T On reduction of linear two variable functional equations to differential equations without substitutions. %J Aequationes mathematicae %D 1992 %P 236-247 %V 43 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137467/ %F AM2_1992__43_1_137467