%0 Journal Article %A Marek Balcerzak %T Generalized projections of Borel and analytic sets %J Colloquium Mathematicum %D 1996 %P 47-53 %V 71 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-71-1-47-53/ %R 10.4064/cm-71-1-47-53 %G en %F 10_4064_cm_71_1_47_53