@article{IM2_1982_18_1_a5,
     author = {V. V. Nikulin},
     title = {On the classification of arithmetic groups generated by reflections in {Lobachevsky} spaces},
     journal = {Izvestiya. Mathematics },
     pages = {99--123},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1982_18_1_a5/}
}