@article{GDZPPN001263420, title = {The smallest ideals in the two natural products on \ss S.}, journal = {Semigroup forum}, volume = {48}, year = {1994}, pages = {363-368}, url = {http://dml.mathdoc.fr/item/GDZPPN001263420} }
Anthony, P. The smallest ideals in the two natural products on ßS.. Semigroup forum, Tome 48 (1994) pp. 363-368. http://gdmltest.u-ga.fr/item/GDZPPN001263420/