@article{GDZPPN001263625, title = {Points very close to the smallest ideal of \ss S.}, journal = {Semigroup forum}, volume = {48}, year = {1994}, pages = {137-142}, zbl = {0826.22005}, url = {http://dml.mathdoc.fr/item/GDZPPN001263625} }
Hindman, N.; Lisan, A.T. Points very close to the smallest ideal of ßS.. Semigroup forum, Tome 48 (1994) pp. 137-142. http://gdmltest.u-ga.fr/item/GDZPPN001263625/