@article{SF_1979__17_134314,
     author = {A. Varisco and Spoletini, A. Cherubini},
     title = {Some properties of {E-m} semigroups.},
     journal = {Semigroup forum},
     pages = {153--162},
     publisher = {mathdoc},
     volume = {17},
     year = {1979},
     zbl = {0404.20053},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__17_134314/}
}