@article{SF_1971__3_133841,
     author = {K.H. Hofmann and M. Mislove},
     title = {The centralizing theorem for left normal groups of units in compact monoids.},
     journal = {Semigroup forum},
     pages = {31--42},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0223.22002},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133841/}
}