@article{DAN_1979_248_6_a5,
     author = {V. V. Nikulin},
     title = {On factor groups of the automorphism groups of hyperbolic forms modulo subgroups generated by 2-reflections},
     journal = {Doklady Akademii Nauk},
     pages = {1307--1309},
     publisher = {mathdoc},
     volume = {248},
     number = {6},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_248_6_a5/}
}