Free groups in ßN which miss the minimal ideal.
Semigroup forum, Tome 37 (1988) no. 1, pp. 233-240
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ZblAmha Tume Lisan. Free groups in ßN which miss the minimal ideal.. Semigroup forum, Tome 37 (1988) no. 1, pp. 233-240. http://geodesic.mathdoc.fr/item/SF_1988__37_1_134927/
@article{SF_1988__37_1_134927,
author = {Amha Tume Lisan},
title = {Free groups in {{\ss}N} which miss the minimal ideal.},
journal = {Semigroup forum},
pages = {233--240},
year = {1988},
volume = {37},
number = {1},
zbl = {0652.22003},
url = {http://geodesic.mathdoc.fr/item/SF_1988__37_1_134927/}
}