@article{SF_1992__45_3_135192,
     author = {A. Ali Ismaeel},
     title = {On some problems of {Petrich} concerning {Br\"uck} and {Reilly} semigroups.},
     journal = {Semigroup forum},
     pages = {283--287},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1992},
     zbl = {0787.20037},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135192/}
}