@article{SF_1978__16_134282,
     author = {W.D. Burgess and R. Raphael},
     title = {On {Conrad's} partial order relation on semiprime rings and semigroups.},
     journal = {Semigroup forum},
     pages = {133--140},
     publisher = {mathdoc},
     volume = {16},
     year = {1978},
     zbl = {0382.06019},
     url = {http://geodesic.mathdoc.fr/item/SF_1978__16_134282/}
}