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Supported by the National Research Council of Canada, Grant No. A3961.
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Bell, H.E. The 3-centre and commutativity theorems. Acta Mathematica Academiae Scientiarum Hungaricae 34, 341–346 (1979). https://doi.org/10.1007/BF01896130
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DOI: https://doi.org/10.1007/BF01896130