Geodesic
Finitely generated almost universal varieties of $0$-lattices
Commentationes Mathematicae Universitatis Carolinae, Tome 46 (2005) no. 2, pp. 301-325.

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A concrete category $\Bbb K$ is (algebraically) {\it universal\/} if any category of algebras has a full embedding into $\Bbb K$, and $\Bbb K$ is {\it almost universal\/} if there is a class $\Cal C$ of $\Bbb K$-objects such that all non-constant homomorphisms between them form a universal category. The main result of this paper fully characterizes the finitely generated varieties of $0$-lattices which are almost universal.
Classification : 06B20, 06D15, 08A35, 08B15, 08C15, 18B15
Keywords: (algebraically) universal category; finite-to-finite universal category; almost universal category; $0$-lattice; variety of $0$-lattices 
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     title = {Finitely generated almost universal varieties of $0$-lattices},
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Koubek, V.; Sichler, J. Finitely generated almost universal varieties of $0$-lattices. Commentationes Mathematicae Universitatis Carolinae, Tome 46 (2005) no. 2, pp. 301-325. http://geodesic.mathdoc.fr/item/CMUC_2005__46_2_a6/