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@article{SF_1984__30_134703, author = {P. Milnes and N. Hindman}, title = {The ideal structure of {XX.}}, journal = {Semigroup forum}, pages = {41--52}, publisher = {mathdoc}, volume = {30}, year = {1984}, zbl = {0532.22004}, url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134703/} }
P. Milnes; N. Hindman. The ideal structure of XX.. Semigroup forum, Tome 30 (1984), pp. 41-52. http://geodesic.mathdoc.fr/item/SF_1984__30_134703/