@article{GDZPPN001250264,
title = {Ideal extensions of irreductive semigroups.},
journal = {Semigroup forum},
volume = {7},
year = {1974},
pages = {216-240},
zbl = {0293.20050},
url = {http://dml.mathdoc.fr/item/GDZPPN001250264}
}
Schein, B.M.; Gluskin, L.M. Ideal extensions of irreductive semigroups.. Semigroup forum, Tome 7 (1974) pp. 216-240. http://gdmltest.u-ga.fr/item/GDZPPN001250264/