@article{DAN_1983_272_2_a11,
     author = {I. I. Parovichenko},
     title = {Algebraic systems containing semigroups of ultrafilter type},
     journal = {Doklady Akademii Nauk},
     pages = {304--307},
     publisher = {mathdoc},
     volume = {272},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_272_2_a11/}
}