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The research of the first author was supported in part by NSF grant MCS79-03693. In a slightly different form this work appears as part of [10].
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Evans, T., Hartman, P.A. Varieties of lattice-ordered algebras. Algebra Universalis 17, 376–392 (1983). https://doi.org/10.1007/BF01194545
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DOI: https://doi.org/10.1007/BF01194545