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@article{AM2_1975__12_136483, author = {Yik-Hoi Au-Yeung}, title = {A {Simple} {Proof} of the {Convexity} of the {Field} of {Values} {Defined} by {Two} {Hermitian} {Forms.}}, journal = {Aequationes mathematicae}, pages = {82--83}, publisher = {mathdoc}, volume = {12}, year = {1975}, zbl = {0307.15009}, url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136483/} }
Yik-Hoi Au-Yeung. A Simple Proof of the Convexity of the Field of Values Defined by Two Hermitian Forms.. Aequationes mathematicae, Tome 12 (1975), pp. 82-83. http://geodesic.mathdoc.fr/item/AM2_1975__12_136483/