@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/