A Simple Proof of the Convexity of the Field of Values Defined by Two Hermitian Forms.
Aequationes mathematicae, Tome 12 (1975), pp. 82-83.

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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/}
}
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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/