@article{MAT_1963_7_2_a1,
     author = {D. M. Kan and G. W. Whitehead},
     title = {On the realizability of singular cohomology groups},
     journal = {Matematika},
     pages = {27--28},
     year = {1963},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1963_7_2_a1/}
}