@article{MASLO_1984_34_4_a1,
     author = {Fabrici, Imrich},
     title = {Semigroups containing covered two-sided ideals},
     journal = {Mathematica slovaca},
     pages = {355--363},
     year = {1984},
     volume = {34},
     number = {4},
     mrnumber = {775242},
     zbl = {0601.20056},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1984_34_4_a1/}
}