@article{DAN_1989_308_1_a10,
     author = {K. E. Starkov},
     title = {A global property of an observation space},
     journal = {Doklady Akademii Nauk},
     pages = {50--52},
     publisher = {mathdoc},
     volume = {308},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_1_a10/}
}