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Research supported by ARC Grant A68831070 (Davey) and NSF Grant DMS 89 04014 (McKenzie).
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Davey, B.A., Heindorf, L. & McKenzie, R. Near unanimity: an obstacle to general duality theory. Algebra Universalis 33, 428–439 (1995). https://doi.org/10.1007/BF01190710
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DOI: https://doi.org/10.1007/BF01190710