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@article{SF_1985__32_134787, author = {N. Hindman}, title = {The minimal ideals of a multiplicative and additive subsemigroup of {{\ss}N.}}, journal = {Semigroup forum}, pages = {283--292}, publisher = {mathdoc}, volume = {32}, year = {1985}, zbl = {0576.22006}, url = {http://geodesic.mathdoc.fr/item/SF_1985__32_134787/} }
N. Hindman. The minimal ideals of a multiplicative and additive subsemigroup of ßN.. Semigroup forum, Tome 32 (1985), pp. 283-292. http://geodesic.mathdoc.fr/item/SF_1985__32_134787/