@article{DAN_1976_228_2_a11,
     author = {S. A. Rakov},
     title = {$C$-convexity and the ``problem of there spaces''},
     journal = {Doklady Akademii Nauk},
     pages = {303--305},
     publisher = {mathdoc},
     volume = {228},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_2_a11/}
}