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The first author was supported for this work at the Gesamthochschule Kassel by a grant grom the Humboldt Foundation of W. Germany.
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Clark, D.M., Krauss, P.H. Plain para primal algebras. Algebra Universalis 11, 365–388 (1980). https://doi.org/10.1007/BF02483114
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DOI: https://doi.org/10.1007/BF02483114