TY - JOUR AU - Brumfield, G. AU - Hilden, Hugh Michael AU - Lozano Imízcoz, María Teresa AU - Montesinos Amilibia, José María AU - Ramírez Losada, E. AU - Short, H. AU - Tejada Cazorla, Juan Antonio AU - Toro, M. PY - 2008 SN - 1405-213X UR - https://hdl.handle.net/20.500.14352/50724 T2 - Boletín de la Sociedad Matemática Mexicana. Tercera Serie AB - A finite covolume, discrete group of hyperbolic isometries U, acting on H3, is said to be universal if for every closed orientable 3-manifold M3 there is a finite index subgroup G of U so that M3=H3/G. It has been shown [H. M. Hilden et al., Invent.... LA - eng M2 - 263 PB - Sociedad Matemática Mexicana KW - branched covering KW - universal link KW - universal group TI - Three manifolds as geometric branched coverings of the three sphere. TY - journal article VL - 14 ER -