%0 Journal Article %A D. M. Kan %A G. W. Whitehead %T On the realizability of singular cohomology groups %J Matematika %D 1963 %P 27-28 %V 7 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAT_1963_7_2_a1/ %G ru %F MAT_1963_7_2_a1