%0 Journal Article %A Michael Mather %A Marshall Walker %T Commuting Homotopy Limits and Colimits. %J Mathematische Zeitschrift %D 1980 %P 77-80 %V 175 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1980__175_173022/ %F MZ_1980__175_173022