@article{GDZPPN001260332,
title = {Principal continuum congruences, regular ...-classes and local subsemigroups.},
journal = {Semigroup forum},
volume = {40},
year = {1990},
pages = {205-226},
zbl = {0692.20055},
url = {http://dml.mathdoc.fr/item/GDZPPN001260332}
}
Magill, K.D. jr.; Misra, P.R. Principal continuum congruences, regular ...-classes and local subsemigroups.. Semigroup forum, Tome 40 (1990) pp. 205-226. http://gdmltest.u-ga.fr/item/GDZPPN001260332/