@article{SF_1979__18_134367,
     author = {A. Varisco and Spoletini A. Cherubini},
     title = {Power cancellative semigroups.},
     journal = {Semigroup forum},
     pages = {381--384},
     publisher = {mathdoc},
     volume = {18},
     year = {1979},
     zbl = {0431.20048},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134367/}
}