%0 Journal Article
%A Kemp, R. R. D.
%A Lee, S. J.
%T Finite Dimensional Perturbations of Differential Expressions
%J Canadian journal of mathematics
%D 1976
%P 1082-1104
%V 28
%N 5
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-108-4/
%R 10.4153/CJM-1976-108-4
%F 10_4153_CJM_1976_108_4