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Some arithmetical discrete groups in Lobacevskii spaces. (English) Zbl 0316.10013
Discrete Subgroups of Lie Groups Appl. Moduli, Pap. Bombay Colloq. 1973, 323-348 (1975).

11E57 Classical groups
11E16 General binary quadratic forms
51M10 Hyperbolic and elliptic geometries (general) and generalizations
20H15 Other geometric groups, including crystallographic groups
20G30 Linear algebraic groups over global fields and their integers