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

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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 $2^\omega$. 
@article{MT_2012_15_2_a4,
     author = {A. V. Kravchenko},
     title = {Complexity of quasivariety lattices for varieties of differential {groupoids.~II}},
     journal = {Matemati\v{c}eskie trudy},
     pages = {89--99},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2012_15_2_a4/}
}
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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/