@article{DAN_1996_350_3_a4,
     author = {E. S. Polovinkin},
     title = {On convex and strongly convex approximations of sets},
     journal = {Doklady Akademii Nauk},
     pages = {308--311},
     publisher = {mathdoc},
     volume = {350},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1996_350_3_a4/}
}