@article{MZM_1991_50_3_a0,
     author = {S. Z. Arutyunyan},
     title = {The~geometry of submanifolds of a {pseudo-Euclidean} space $E^n_{2n}$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {3--11},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_3_a0/}
}