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@article{SF_1994__49_2_135342, author = {N. Hindman and A.T. Lisan}, title = {Points very close to the smallest ideal of {{\ss}S.}}, journal = {Semigroup forum}, pages = {137--142}, publisher = {mathdoc}, volume = {49}, number = {2}, year = {1994}, zbl = {0826.22005}, url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135342/} }
N. Hindman; A.T. Lisan. Points very close to the smallest ideal of ßS.. Semigroup forum, Tome 49 (1994) no. 2, pp. 137-142. http://geodesic.mathdoc.fr/item/SF_1994__49_2_135342/