@article{00763835,
title = {A class of quasi-adequate transformation semigroups.},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {51},
year = {1994},
pages = {553-570},
zbl = {0828.20066},
language = {en},
url = {http://dml.mathdoc.fr/item/00763835}
}
Umar, Abdullahi. A class of quasi-adequate transformation semigroups.. Portugaliae Mathematica. Nova Série, Tome 51 (1994) pp. 553-570. http://gdmltest.u-ga.fr/item/00763835/