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This research was supported in part by the National Science Foundation under contract GP 4337.
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Chang, BC., Smith, J.W. The extension problem for functions invariant under a group. Monatshefte für Mathematik 72, 118–132 (1968). https://doi.org/10.1007/BF01298150
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DOI: https://doi.org/10.1007/BF01298150