Geodesic
A characterization of quasivarieties of partial algebras by means of limits and products
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 1 (2004), pp. 35-37.

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It is proved that a class of partial algebras is a quasivariety if and only if it is closed under surjective direct limits and subdirect products. 
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M. S. Sheremet. A characterization of quasivarieties of partial algebras by means of limits and products. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 1 (2004), pp. 35-37. http://geodesic.mathdoc.fr/item/SEMR_2004_1_a2/

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