%0 Journal Article %A Stefan Jackowski %A Jolanta Słomińska %T $G$-functors, $G$-posets and homotopy decompositions of $G$-spaces %J Fundamenta Mathematicae %D 2001 %P 249-287 %V 169 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm169-3-4/ %R 10.4064/fm169-3-4 %G en %F 10_4064_fm169_3_4