@article{DAN_1969_184_6_a10,
     author = {M. M. Choban},
     title = {Mappings of metric spaces},
     journal = {Doklady Akademii Nauk},
     pages = {1298--1300},
     publisher = {mathdoc},
     volume = {184},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_6_a10/}
}