Geodesic
Complexity of Quasivariety Lattices for Varieties of Unary Algebras
Matematičeskie trudy, Tome 4 (2001) no. 2, pp. 113-127.

Voir la notice de l'article provenant de la source Math-Net.Ru

With the help of the sufficient conditions of [1, 2] for $\mathcal Q$-universality we show that, for each $n\geqslant 2$, there exists a minimal $\mathcal Q$-universal variety of unary algebras with $n$ fundamental operations. 
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A. V. Kravchenko. Complexity of Quasivariety Lattices for Varieties of Unary Algebras. Matematičeskie trudy, Tome 4 (2001) no. 2, pp. 113-127. http://geodesic.mathdoc.fr/item/MT_2001_4_2_a5/

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