%0 Journal Article %A Piotr Hajłasz %T A Sard type theorem for Borel mappings %J Colloquium Mathematicum %D 1994 %P 217-221 %V 67 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-67-2-217-221/ %R 10.4064/cm-67-2-217-221 %G en %F 10_4064_cm_67_2_217_221