@article{MZM_1986_39_6_a13,
     author = {T. N. Savitskaya},
     title = {$k${-Invariants} in kan fibrations with fiber~$K(G,n)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {904--917},
     publisher = {mathdoc},
     volume = {39},
     number = {6},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_6_a13/}
}