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The research of the second named author was supported by National Research Council Grant A-8789.
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Cornish, W.H., Stewart, P.N. Direct and subdirect decompositions of universal algebras with a Boolean orthogonality. Acta Mathematica Academiae Scientiarum Hungaricae 38, 9–14 (1981). https://doi.org/10.1007/BF01917513
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DOI: https://doi.org/10.1007/BF01917513