@article{GDZPPN001256939, title = {Rees quotients of N-semigroups.}, journal = {Semigroup forum}, volume = {30}, year = {1984}, pages = {259-270}, zbl = {0553.20039}, url = {http://dml.mathdoc.fr/item/GDZPPN001256939} }
Clarke, J. Rees quotients of N-semigroups.. Semigroup forum, Tome 30 (1984) pp. 259-270. http://gdmltest.u-ga.fr/item/GDZPPN001256939/