@article{SF_1984__29_134697,
     author = {M. Gould and J. Iskra and C. Tsinakis},
     title = {Globals of completely regular periodic semigroups.},
     journal = {Semigroup forum},
     pages = {365--374},
     publisher = {mathdoc},
     volume = {29},
     year = {1984},
     zbl = {0553.20036},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134697/}
}