TY  - JOUR
AU  - Gh. Constantin
TI  - On operators with the same spectrum
JO  - Matematički vesnik
PY  - 1975
SP  - 25 
VL  - 27
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MV_1975_27_1_a2/
ID  - MV_1975_27_1_a2
ER  -