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The research of the second author was supported (in part) by Air Force Contract AF 49 (638)-1401.
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Kohls, C.W., Lardy, L.J. On extensions and bimultiplication algebras of algebras. Arch. Math 20, 365–372 (1969). https://doi.org/10.1007/BF01899591
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DOI: https://doi.org/10.1007/BF01899591