1. E. Hewitt andS. Kakutani, A class of multiplicative linear functionals on the measure algebra of a locally compact abelian group,Illinois J. Math.,4 (1960), 553–574.
2. W. Rudin,Fourier analysis on groups, Interscience Publishers (New York, 1962).
3. Y. Ŝreider, The structure of maximal ideals of rings of measures with convolution,Mat. Sbornik,27 (1950), 297–318 (in Russian).
4. J. Williamson, Banach Algebras elements with independent Powers, and theorem of Wiener—Pitt type,Functional Algebra, ed. by Scott and Foresman (1966), 186–197.
5. J. Williamson, Raikov Systems,Symposia of theoretical Physics and Math.,8 (New York, 1968), 173–183.