@article{SEMR_2020_17_a14,
     author = {A. V. Kravchenko and M. V. Schwidefsky},
     title = {On the complexity of the lattices of subvarieties and congruences. {II.} {Differential} groupoids and unary algebras},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {753--768},
     publisher = {mathdoc},
     volume = {17},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2020_17_a14/}
}