@article{SF_1993__46_1_135225,
     author = {J.A. Hildebrant},
     title = {Divisible and exponent actions of semigroups.},
     journal = {Semigroup forum},
     pages = {138--145},
     year = {1993},
     volume = {46},
     number = {1},
     zbl = {0774.20045},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135225/}
}