Geodesic
Complexity of quasivariety lattices for varieties of differential groupoids
Matematičeskie trudy, Tome 12 (2009) no. 1, pp. 26-39 Cet article a éte moissonné depuis la source Math-Net.Ru

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In 1987, Romanowska and Roszkowska found an explicit description of the lattice of varieties of differential groupoids. In 2008, the author proved that the lattice of quasivarieties of differential groupoids is $Q$-universal. In the present article, we find an example of a minimal $Q$-universal variety of differential groupoids. 
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A. V. Kravchenko. Complexity of quasivariety lattices for varieties of differential groupoids. Matematičeskie trudy, Tome 12 (2009) no. 1, pp. 26-39. http://geodesic.mathdoc.fr/item/MT_2009_12_1_a1/

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