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  3. Marston Conder, Gaven Martin, and Anna Torstensson, Maximal symmetry groups of hyperbolic 3-manifolds, New Zealand J. Math. 35 (2006), no. 1, 37–62.[MR]
  4. C. Maclachlan and G. J. Martin, The non-compact arithmetic generalised triangle groups, Topology 40 (2001), no. 5, 927–944.[MR]