@article{DAN_1960_133_4_a1,
     author = {V. G. Boltyanskii and M. M. Postnikov},
     title = {On principal notions of algebraic topology. {Axiomatic} definition of cohomology groups},
     journal = {Doklady Akademii Nauk},
     pages = {745--747},
     publisher = {mathdoc},
     volume = {133},
     number = {4},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_4_a1/}
}