@article{SF_1974__8_134024,
     author = {John D. McCharen},
     title = {An application of peripherality to compact semigroups.},
     journal = {Semigroup forum},
     pages = {56--64},
     year = {1974},
     volume = {8},
     zbl = {0295.22005},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__8_134024/}
}