%0 Journal Article %A D. BURGHELEA %T Some Properties of Homotopy Classes of Maps of Kan Spectra. %J Inventiones mathematicae %D 1968 %P 1-7 %V 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1968__5_141901/ %F IM_1968__5_141901