%0 Journal Article %A Yu. G. Reshetnyak %T Generalized derivatives and differentiability almost everywhere %J Sbornik. Mathematics %D 1968 %P 293-302 %V 4 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1968_4_3_a0/ %G en %F SM_1968_4_3_a0