Geodesic
Boundary Points of the Numerical Range of an Operator
Canadian mathematical bulletin, Tome 17 (1975) no. 5, pp. 689-692

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The purpose of this note is to investigate boundary points of the numerical range of an operator in terms of inner and outer center points. Some applications on commutators are given.Throughout this note, an operator will always mean a bounded linear operator on a Hilbert space X. 
Lin, C.-S. Boundary Points of the Numerical Range of an Operator. Canadian mathematical bulletin, Tome 17 (1975) no. 5, pp. 689-692. doi: 10.4153/CMB-1974-125-5
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     title = {Boundary {Points} of the {Numerical} {Range} of an {Operator}},
     journal = {Canadian mathematical bulletin},
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     year = {1975},
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     number = {5},
     doi = {10.4153/CMB-1974-125-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-125-5/}
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