%0 Journal Article %A Eggar, M. H. %T Ex-homotopy theory %J Compositio Mathematica %D 1973 %P 185-195 %V 27 %N 2 %I Noordhoff International Publishing %U http://archive.numdam.org/item/CM_1973__27_2_185_0/ %G en %F CM_1973__27_2_185_0