@article{IVM_1960_6_a3,
     author = {Yu. F. Borisov},
     title = {Mappings of {a~pseudo-Euclidean} space which preserve isotropic vectors},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {31--39},
     publisher = {mathdoc},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1960_6_a3/}
}