1. Some algebras of operators with closed convex numerical ranges;de Barra,1972
2. Generalized limits and uniform convexity;de Barra,1974
3. Numerical Ranges of Operators on Normed Spaces and Elements of Normed Algebras;Bonsall,1971
4. Numerical Ranges II;Bonsall,1973
5. Some general conditions implying Weyl's theorem;Baxley;Rev. Roumaine Math. Pures Appl.,1971