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@article{DAN_1978_238_6_a0, author = {\`E. Vinberg and I. M. Kaplinskaya}, title = {On the groups $O_{18,1}(\mathbf{Z})$ and $O_{19,1}(\mathbf{Z})$}, journal = {Doklady Akademii Nauk}, pages = {1273--1275}, publisher = {mathdoc}, volume = {238}, number = {6}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_238_6_a0/} }
È. Vinberg; I. M. Kaplinskaya. On the groups $O_{18,1}(\mathbf{Z})$ and $O_{19,1}(\mathbf{Z})$. Doklady Akademii Nauk, Tome 238 (1978) no. 6, pp. 1273-1275. http://geodesic.mathdoc.fr/item/DAN_1978_238_6_a0/