@article{MT_1987_9_a13,
     author = {W. G. Gaydalovich and U. Il'khamov and D. D. Sokoloff},
     title = {Closed convex surfaces in a {pseudo-Euclidean} space},
     journal = {Matemati\v{c}eskie trudy},
     pages = {154--159},
     publisher = {mathdoc},
     volume = {9},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1987_9_a13/}
}