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This work was supported in part by the N.S.E.R.C. Operating Grant No. A4077.
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Pouzet, M., Rival, I. Every countable lattice is a retract of a direct product of chains. Algebra Universalis 18, 295–307 (1984). https://doi.org/10.1007/BF01203367
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DOI: https://doi.org/10.1007/BF01203367