@article{GDZPPN001253840, title = {A projective limit characterization of GIF semigroups with an N-congruence.}, journal = {Semigroup forum}, volume = {20}, year = {1980}, pages = {267-282}, zbl = {0431.20050}, url = {http://dml.mathdoc.fr/item/GDZPPN001253840} }
Lord, J.M. A projective limit characterization of GIF semigroups with an N-congruence.. Semigroup forum, Tome 20 (1980) pp. 267-282. http://gdmltest.u-ga.fr/item/GDZPPN001253840/