@article{KUTGS_1979_11_a5,
     author = {V. G. Kopp},
     title = {Geometry of a~neutral space},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {56--63},
     publisher = {mathdoc},
     volume = {11},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1979_11_a5/}
}