@article{SF_1984__28_134635,
     author = {M. Gould and J.A. Iskra},
     title = {Globally determined semigroups.},
     journal = {Semigroup forum},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {28},
     year = {1984},
     zbl = {0528.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__28_134635/}
}