%0 Journal Article %A V. Bartik %T Aleksandrov–Chekh cohomology and mappings into Eilenberg–Maclane %J Sbornik. Mathematics %D 1968 %P 221-228 %V 5 %N 2 %U http://geodesic.mathdoc.fr/item/SM_1968_5_2_a4/ %G en %F SM_1968_5_2_a4