@article{MZM_1985_38_2_a16,
     author = {A. A. Stepanova},
     title = {Semigroups generating categorical {Horn} classes},
     journal = {Matemati\v{c}eskie zametki},
     pages = {317--324},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_2_a16/}
}