@article{DAN_1963_151_4_a7,
     author = {O. V. Lokutsievskii},
     title = {On a problem of {P.} {S.~Urysohn}},
     journal = {Doklady Akademii Nauk},
     pages = {775--777},
     year = {1963},
     volume = {151},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_4_a7/}
}