@article{INTG_1977_8_a12,
     author = {D. D. Sokolov},
     title = {The regularity of convex surfaces with definite metric in three-dimensional {pseudo-Euclidean} space},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {257--277},
     year = {1977},
     volume = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1977_8_a12/}
}