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@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/} }
A. Ali Ismaeel. On some problems of Petrich concerning Brück and Reilly semigroups.. Semigroup forum, Tome 45 (1992) no. 3, pp. 283-287. http://geodesic.mathdoc.fr/item/SF_1992__45_3_135192/