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Byrd, R.D., Lloyd, J.T., Mena, R.A. et al. Retractable groups. Acta Mathematica Academiae Scientiarum Hungaricae 29, 219–233 (1977). https://doi.org/10.1007/BF01895841
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DOI: https://doi.org/10.1007/BF01895841