@article{INTG_1980_11_a4,
     author = {D. D. Sokolov},
     title = {Surfaces in {pseudo-Euclidean} space},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {177--201},
     publisher = {mathdoc},
     volume = {11},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1980_11_a4/}
}