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Published in Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 162, pp. 77–106, 1987.
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Grunewald, F., Elstrodt, J. & Mennicke, J. Some remarks on discrete subgroups of SL2(¢)* . J Math Sci 46, 1760–1788 (1989). https://doi.org/10.1007/BF01099347
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DOI: https://doi.org/10.1007/BF01099347