TY  - JOUR
AU  - Putnam, C. R.
TI  - Positive Perturbations and Unitary Equivalence
JO  - Canadian journal of mathematics
PY  - 1977
SP  - 161
EP  - 164
VL  - 29
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-015-0/
DO  - 10.4153/CJM-1977-015-0
ID  - 10_4153_CJM_1977_015_0
ER  -