Geodesic
Complexity of quasivariety lattices for varieties of differential groupoids.~II
Matematičeskie trudy, Tome 15 (2012) no. 2, pp. 89-99.

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

We continue the study of the lattice of quasivarieties of differential groupoids. We suggest a method for constructing differential groupoids from graphs. We prove that, for every variety of differential groupoids, the cardinality of the lattice of subquasivarieties is either finite or equal to $2^\omega$. 
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A. V. Kravchenko. Complexity of quasivariety lattices for varieties of differential groupoids.~II. Matematičeskie trudy, Tome 15 (2012) no. 2, pp. 89-99. http://geodesic.mathdoc.fr/item/MT_2012_15_2_a4/

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