Banach algebras
Translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 81, 38-65 (Russian) (1978; Zbl 0457.46035).
spectral radius formula in quotient algebras
Cohen-Rudin characterization of homomorphisms of measure algebras
scientific article; zbMATH DE number 3863871