@article{MZM_1971_9_2_a9,
     author = {D. D. Sokolov},
     title = {Imbedding of {pseudo-Riemannian} manifolds in a pseudo-euclidean space},
     journal = {Matemati\v{c}eskie zametki},
     pages = {193--198},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_2_a9/}
}