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@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/} }
A. El-Qallali. Quasi-adequate semigroups II.. Semigroup forum, Tome 44 (1992) no. 1, pp. 273-282. http://geodesic.mathdoc.fr/item/SF_1992__44_1_135151/