@article{SF_1993__47_2_135265,
     author = {U. Asibong-Ibe},
     title = {*-Simple type {A} ...-semigroups.},
     journal = {Semigroup forum},
     pages = {135--149},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1993},
     zbl = {0791.20070},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135265/}
}