%0 Journal Article
%A Berg, I. D.
%T Index Theory for Perturbations of Direct Sums of Normal Operators and Weighted Shifts
%J Canadian journal of mathematics
%D 1978
%P 1152-1165
%V 30
%N 6
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-096-4/
%R 10.4153/CJM-1978-096-4
%F 10_4153_CJM_1978_096_4