TY  - JOUR
AU  - Lin, C.-S.
TI  - Boundary Points of the Numerical Range of an Operator
JO  - Canadian mathematical bulletin
PY  - 1975
SP  - 689
EP  - 692
VL  - 17
IS  - 5
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-125-5/
DO  - 10.4153/CMB-1974-125-5
ID  - 10_4153_CMB_1974_125_5
ER  -