@article{SF_1995__50_3_135371,
     author = {S. Seif},
     title = {E-minimal semigroups.},
     journal = {Semigroup forum},
     pages = {117--120},
     year = {1995},
     volume = {50},
     number = {3},
     zbl = {0815.20057},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135371/}
}