1. A separable group having a discrete dual space is compact;Baggett;J. Funct. Anal.,1972
2. Eléments de mathématique;Bourbaki,1961
3. Eléments de mathématique;Bourbaki,1963
4. Representation theory of finite groups and associative algebras;Curtis,1962
5. Hopf-von Neumann algebras, Functional analysis;Ernest,1967