Geodesic
On groups of unit elements of certain quadratic forms
Sbornik. Mathematics, Tome 16 (1972) no. 1, pp. 17-35 Cet article a éte moissonné depuis la source Math-Net.Ru

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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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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/

[1] H. S. M. Coxeter, “Discrete groups generated by reflections”, Ann. Math., 35:3 (1934), 588–621 | DOI | MR | Zbl

[2] F. Lanner, On complexes with transitive groups of automorphisms, Lunds Univ. Math. Sem., 11, 1950 | MR | Zbl

[3] E. B. Vinberg, “Diskretnye gruppy, porozhdennye otrazheniyami, v prostranstvakh Lobachevskogo”, Matem. sb., 72(114) (1967), 471–488 | MR | Zbl

[4] E. M. Andreev, “O peresechenii ploskostei granei mnogogrannikov s ostrymi uglami”, Matem. zametki, 8:4 (1970) | MR | Zbl