@article{GDZPPN001252720,
title = {On Conrad's partial order relation on semiprime rings and semigroups.},
journal = {Semigroup forum},
volume = {16},
year = {1978},
pages = {133-140},
zbl = {0382.06019},
url = {http://dml.mathdoc.fr/item/GDZPPN001252720}
}
Burgess, W.D.; Raphael, R. On Conrad's partial order relation on semiprime rings and semigroups.. Semigroup forum, Tome 16 (1978) pp. 133-140. http://gdmltest.u-ga.fr/item/GDZPPN001252720/