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Research partially supported by NSF Grants DMS-8700838 and DMS-8901904.
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Weiss, R. A characterization of the groupCo 3 as a transitive extension ofHS . Arch. Math 56, 209–213 (1991). https://doi.org/10.1007/BF01190206
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DOI: https://doi.org/10.1007/BF01190206