@article{DAN_1981_256_2_a4,
     author = {R. Oinarov},
     title = {On the properties of a {Urysohn} operator},
     journal = {Doklady Akademii Nauk},
     pages = {281--284},
     publisher = {mathdoc},
     volume = {256},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_256_2_a4/}
}