@article{GDZPPN001257064,
title = {The ideal structure of XX.},
journal = {Semigroup forum},
volume = {30},
year = {1984},
pages = {41-52},
zbl = {0532.22004},
url = {http://dml.mathdoc.fr/item/GDZPPN001257064}
}
Milnes, P.; Hindman, N. The ideal structure of XX.. Semigroup forum, Tome 30 (1984) pp. 41-52. http://gdmltest.u-ga.fr/item/GDZPPN001257064/