@article{DAN_1982_267_2_a9,
     author = {I. G. Nikolaev and S. Z. Shefel'},
     title = {Smoothness of convex surfaces on the basis of differential properties of quasiconformal mappings},
     journal = {Doklady Akademii Nauk},
     pages = {296--300},
     publisher = {mathdoc},
     volume = {267},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_267_2_a9/}
}