@article{SF_1976__13_134215,
     author = {S.A. Rankin and C.M. Reis and M.L. Wang},
     title = {Globally {Abelian} transformation semigroups.},
     journal = {Semigroup forum},
     pages = {221--228},
     publisher = {mathdoc},
     volume = {13},
     year = {1976},
     zbl = {0353.20054},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134215/}
}