%0 Journal Article %A D. B. A. EPSTEIN %T Steenrod Operations in Homological Algebra. %J Inventiones mathematicae %D 1966 %P 152-208 %V 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1966__1_141832/ %F IM_1966__1_141832