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