@article{SF_1995__50_3_135393,
     author = {M. Zeitoun},
     title = {The join of the pseudovarieties of idempotent semigroups and locally trivial semigroups.},
     journal = {Semigroup forum},
     pages = {367--382},
     year = {1995},
     volume = {50},
     number = {3},
     zbl = {0840.20063},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135393/}
}