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REFERENCES
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Sah, Chih-han, Groups related to compact Riemann surfaces, Acta Math. 123 (1969) 13-42.
E. B. Vinber and O. V. Shvartsman, Riemann surfaces, Journal of Mathematical Sciences, 14, #1 (1980), 985-1020. Riemann surfaces, Algebra, Topologiya, Geometriya, Vol. 16 (Russian), pp. 191-245, 247 (errata insert), VINITI , Moscow, 1978.
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