@article{SEMR_2012_9_a2,
     author = {A. V. Kravchenko},
     title = {Minimal quasivarieties of differential groupoids with nonzero multiplication},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {201--207},
     publisher = {mathdoc},
     volume = {9},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2012_9_a2/}
}