1. Propriétés spectrales des algèbres de Banach;Aupetit,1979
2. Caractérisation spectrale des algèbres de Jordan–Banach n.c complexes modulairess annihilatrices;Benslimane;J. Algebra,1991
3. Numerical ranges of operators on normed spaces and of elements of normed algebras;Bonsall,1971
4. Linear Operators;Dunford,1958
5. Multiplicative Norms on Banach Algebras;Edwards,1950