@article{GDZPPN001257218,
title = {Semigroups for which the continuum congruences form finite chains.},
journal = {Semigroup forum},
volume = {30},
year = {1984},
pages = {221-230},
zbl = {0533.20037},
url = {http://dml.mathdoc.fr/item/GDZPPN001257218}
}
Magill, K.D. jr. Semigroups for which the continuum congruences form finite chains.. Semigroup forum, Tome 30 (1984) pp. 221-230. http://gdmltest.u-ga.fr/item/GDZPPN001257218/