1. The group of invertible elements of a commutative Banach algebra;Arens;Studia Math.,1963
2. Analytic functions of several Banach algebra elements;Arens;Ann. Math.,1955
3. Algebraic extension of normed algebras;Arens,1956
4. Galois theory for Banach algebras;Brown;Pacific J. Math.,1969
5. On covering spaces and Galois extensions;Childs;Pacific J. Math.,1971