TY  - JOUR
AU  - D. K. Rao
TI  - Symmetric perturbation of a self-adjoint operator
JO  - Revista colombiana de matematicas
PY  - 1973
SP  - 81
EP  - 84
VL  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RCM_1973__7_181602/
ID  - RCM_1973__7_181602
ER  -