Geodesic
On the regularity of convex surfaces with a regular metric in spaces of constant curvature
Doklady Akademii Nauk, Tome 122 (1958) no. 2, pp. 186-187 
A. V. Pogorelov. On the regularity of convex surfaces with a regular metric in spaces of constant curvature. Doklady Akademii Nauk, Tome 122 (1958) no. 2, pp. 186-187. http://geodesic.mathdoc.fr/item/DAN_1958_122_2_a5/
@article{DAN_1958_122_2_a5,
     author = {A. V. Pogorelov},
     title = {On the regularity of convex surfaces with a regular metric in spaces of constant curvature},
     journal = {Doklady Akademii Nauk},
     pages = {186--187},
     year = {1958},
     volume = {122},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_122_2_a5/}
}
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