@article{SF_1971__3_133853,
     author = {C.F. Dunkl and D.E. Ramirez},
     title = {Locally compact subgroups of the spectrum of the measure algebra.},
     journal = {Semigroup forum},
     pages = {95--107},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0227.43004},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133853/}
}