1. N. Dunford and J. Schwartz, Linear operators. Part 1. General theory, Interscience Publishers, N.Y.-London, 1988.
2. T. Gamelin, Uniform Algebras, Chelsea, N.Y., 1969.
3. I. Gelfand, D. Raikov, and G. Shilov, Commutative normed rings, Chelsea, N.Y., 1964.
4. C. Georgakis, The Hausdorff mean of a Fourier–Stieltjes transform, Proc. Amer. Math. Soc. 116 (1992), 465–471.
5. N. Karapetiants and S. Samko, Equations with involutive operators, Birkhäuser, Boston, 2001.