%0 Journal Article %A Dominique Arlettaz %T Characteristic classes and obstruction theory for infinite loop spaces. %J Manuscripta mathematica %D 1989 %P 431-444 %V 64 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155417/ %F MM2_1989__64_2_155417