%0 Journal Article %A Grobler, J. J. %A Raubenheimer, H. %T Spectral properties of elements in different Banach algebras %J Glasgow mathematical journal %D 1991 %P 11-20 %V 33 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007989/ %R 10.1017/S0017089500007989 %F 10_1017_S0017089500007989