%0 Journal Article %A Jack Brown %T Lusin density and Ceder's differentiable restrictions of arbitrary real functions %J Fundamenta Mathematicae %D 1974 %P 35-45 %V 84 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-84-1-35-45/ %R 10.4064/fm-84-1-35-45 %G en %F 10_4064_fm_84_1_35_45