@article{SM_1968_5_2_a4,
     author = {V. Bartik},
     title = {Aleksandrov{\textendash}Chekh cohomology and mappings into {Eilenberg{\textendash}Maclane}},
     journal = {Sbornik. Mathematics},
     pages = {221--228},
     year = {1968},
     volume = {5},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_5_2_a4/}
}