@article{DAN_1971_197_4_a12,
     author = {A. V. Pogorelov},
     title = {On the mean curvature of an infinite complete convex surface},
     journal = {Doklady Akademii Nauk},
     pages = {788--789},
     publisher = {mathdoc},
     volume = {197},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_197_4_a12/}
}