@article{DAN_1970_195_6_a14,
     author = {D. D. Sokoloff},
     title = {On topology of universe models},
     journal = {Doklady Akademii Nauk},
     pages = {1307--1309},
     publisher = {mathdoc},
     volume = {195},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_195_6_a14/}
}