@article{DAN_1958_123_6_a5,
     author = {A. Markov},
     title = {Unsolvability of certain problems in topology},
     journal = {Doklady Akademii Nauk},
     pages = {978--980},
     publisher = {mathdoc},
     volume = {123},
     number = {6},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_123_6_a5/}
}