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This work was supported in part by the U.S. NSF/NSA, Grant Number DMS9001223.
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Waterhouse, W.C. Retractions of separable commutative algebras. Arch. Math 60, 36–39 (1993). https://doi.org/10.1007/BF01194236
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DOI: https://doi.org/10.1007/BF01194236