@article{SF_1982__24_134534,
     author = {S. Rankin and C. Reis},
     title = {A - finite actions and their automorphism groups.},
     journal = {Semigroup forum},
     pages = {39--54},
     year = {1982},
     volume = {24},
     zbl = {0504.20044},
     url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134534/}
}