@article{SF_1993__46_1_135206,
     author = {F. Li},
     title = {The existence of identity of orthodox semigroup rings.},
     journal = {Semigroup forum},
     pages = {27--31},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1993},
     zbl = {0787.16024},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135206/}
}