@article{DAN_1972_206_3_a11,
     author = {B. Shapirovskii},
     title = {On the density of topological spaces},
     journal = {Doklady Akademii Nauk},
     pages = {559--562},
     publisher = {mathdoc},
     volume = {206},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_206_3_a11/}
}