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Leslie Wilson was partially supported by the National Science Foundation under Grant no. MCS 81-00779; and was a guest in Aarhus while most of this work was done.
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du Plessis, A., Wilson, L. On right-equivalence. Math Z 190, 163–205 (1985). https://doi.org/10.1007/BF01160458
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DOI: https://doi.org/10.1007/BF01160458