Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1986__35_134860, author = {S. Bulman-Fleming and K. McDowell}, title = {A non regular perfect semigroup.}, journal = {Semigroup forum}, pages = {119--122}, publisher = {mathdoc}, volume = {35}, year = {1986}, zbl = {0615.20041}, url = {http://geodesic.mathdoc.fr/item/SF_1986__35_134860/} }
S. Bulman-Fleming; K. McDowell. A non regular perfect semigroup.. Semigroup forum, Tome 35 (1986), pp. 119-122. http://geodesic.mathdoc.fr/item/SF_1986__35_134860/