TY  - JOUR
AU  - A. Torgašev
TI  - Certain notes on the numerical range of an unbounded operator
JO  - Matematički vesnik
PY  - 1975
SP  - 189 
VL  - 27
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MV_1975_27_1_a24/
ID  - MV_1975_27_1_a24
ER  -