@article{DAN_1976_226_1_a2,
     author = {V. G. Boltyanskii},
     title = {On certain classes of convex sets},
     journal = {Doklady Akademii Nauk},
     pages = {19--22},
     publisher = {mathdoc},
     volume = {226},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_226_1_a2/}
}