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Supported by Comité Conjunto Hispano-Norteamericano and in part by NSF Grant 8120790
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Hilden, H.M., Lozano, M.T., Montesinos, J.M. et al. On universal groups and three-manifolds. Invent Math 87, 441–456 (1987). https://doi.org/10.1007/BF01389236
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DOI: https://doi.org/10.1007/BF01389236