@article{SF_1992__44_1_135151,
     author = {A. El-Qallali},
     title = {Quasi-adequate semigroups {II.}},
     journal = {Semigroup forum},
     pages = {273--282},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0747.20029},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135151/}
}