1. Complete normed algebras;Bonsall,1973
2. The joint spectrum of commuting nonnormal operators;Bunce,1971
3. C∗-algebras;Dixmier,1977
4. Remark to a paper of A. E. Frazho: “Models for noncommuting operators”;Durszt;J. Funct. Anal.,1983
5. Notes on Operator Theory;Fillmore,1970