@article{AA_1996_8_3_a2,
     author = {Yu. D. Burago and B. V. Kalinin},
     title = {Smoothness and singularities of convex hypersurfaces},
     journal = {Algebra i analiz},
     pages = {39--55},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1996_8_3_a2/}
}