%0 Journal Article %A A. Lelek %T Dimension inequalities for unions and mappings of separable metric spaces %J Colloquium Mathematicum %D 1971 %P 69-91 %V 23 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-23-1-69-91/ %R 10.4064/cm-23-1-69-91 %G en %F 10_4064_cm_23_1_69_91