Geodesic
The regularity of convex surfaces with definite metric in three-dimensional pseudo-Euclidean space
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 8 (1977), pp. 257-277 
D. D. Sokolov. The regularity of convex surfaces with definite metric in three-dimensional pseudo-Euclidean space. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 8 (1977), pp. 257-277. http://geodesic.mathdoc.fr/item/INTG_1977_8_a12/
@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/}
}
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%D 1977
%P 257-277
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