@article{PPN362162808_0014+dmdlog21,
title = {Congruence relations on left canonic semigroups.},
journal = {Semigroup forum},
volume = {14},
year = {1977},
pages = {175-184},
zbl = {0396.20043},
url = {http://dml.mathdoc.fr/item/PPN362162808_0014+dmdlog21}
}
Yoh, R.W. Congruence relations on left canonic semigroups.. Semigroup forum, Tome 14 (1977) pp. 175-184. http://gdmltest.u-ga.fr/item/PPN362162808_0014+dmdlog21/