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Research support by the National Science Foundation under grant number GP-4221. The result of this paper were announced in abstract 625-95, NAMS 12 (1965), p. 573.
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Grätzer, G. On coverings of universal algebras. Arch. Math 18, 113–117 (1967). https://doi.org/10.1007/BF01899634
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DOI: https://doi.org/10.1007/BF01899634