@article{SF_1972__5_133953,
     author = {J.A. Gerhard},
     title = {Some subdirectly irreducible idem-potent semigroups.},
     journal = {Semigroup forum},
     pages = {362--369},
     publisher = {mathdoc},
     volume = {5},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133953/}
}