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Ježek, Jaroslav
The number of minimal varieties of idempotent groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 1, pp. 199-205
MSC: 08B05, 08B15, 08B99, 20N99 | MR 653364 | Zbl 0502.08008
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[5] D. PIGOZZI: Universal equational theories and varieties of algebras. Annals of Math. Logic 17 (1979), 117-150. MR 0552418 | Zbl 0436.03021
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