%0 Journal Article
%A Putnam, C. R.
%T Positive Perturbations and Unitary Equivalence
%J Canadian journal of mathematics
%D 1977
%P 161-164
%V 29
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-015-0/
%R 10.4153/CJM-1977-015-0
%F 10_4153_CJM_1977_015_0