Geodesic
On groups of unit elements of certain quadratic forms
Sbornik. Mathematics, Tome 16 (1972) no. 1, pp. 17-35

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It is shown that, for the groups of unit elements of certain integral quadratic forms of signature $(n,1)$, there exist subgroups of finite index, generated by reflections; and the generators and relations of these subgroups are found. Bibliography: 4 titles. 
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     title = {On groups of unit elements of certain quadratic forms},
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È. B. Vinberg. On groups of unit elements of certain quadratic forms. Sbornik. Mathematics, Tome 16 (1972) no. 1, pp. 17-35. http://geodesic.mathdoc.fr/item/SM_1972_16_1_a1/