@article{DAN_1969_186_5_a7,
     author = {V. Z. Polyakov},
     title = {Proximally open mappings of metric spaces},
     journal = {Doklady Akademii Nauk},
     pages = {1012--1015},
     publisher = {mathdoc},
     volume = {186},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_5_a7/}
}