@article{GDZPPN001257935,
title = {The minimal ideals of a multiplicative and additive subsemigroup of \ss N.},
journal = {Semigroup forum},
volume = {31},
year = {1985},
pages = {283-292},
zbl = {0576.22006},
url = {http://dml.mathdoc.fr/item/GDZPPN001257935}
}
Hindman, N. The minimal ideals of a multiplicative and additive subsemigroup of ßN.. Semigroup forum, Tome 31 (1985) pp. 283-292. http://gdmltest.u-ga.fr/item/GDZPPN001257935/