@article{SF_1978__16_134299,
     author = {R.H. Oehmke},
     title = {On right congruences of semigroups.},
     journal = {Semigroup forum},
     pages = {393--402},
     year = {1978},
     volume = {16},
     zbl = {0396.20042},
     url = {http://geodesic.mathdoc.fr/item/SF_1978__16_134299/}
}