@article{SF_1994__49_2_135340,
     author = {G. Pirillo and S. Varricchio},
     title = {On uniformly repetitive semigroups.},
     journal = {Semigroup forum},
     pages = {125--130},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1994},
     zbl = {0805.20052},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135340/}
}