1. M. A. Naimark, Normed Rings [in Russian], Nauka, Moscow (1968).
2. W. Zelazko, ?Selected topics in topological algebras,? Lect. Notes, Ser. Math. Aarhus Univ., No. 31, 1?176 (1971).
3. N. Bourbaki, General Topology, Addison-Wesley (1968).
4. I. Kaplansky, ?Topological rings,? Am. J. Math.,69, 153?183 (1947).
5. I. Kaplansky, ?The structure of certain operator algebras,? Trans. Am. Math. Soc.,70, 219?255 (1951).