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The author wishes to thank Professor R. Westwich for his helpful discussion during the preparation of this note.
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Au-Yeung, YH. A simple proof of the convexity of the field of values defined by two hermitian forms. Aeq. Math. 12, 82–83 (1975). https://doi.org/10.1007/BF01834040
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DOI: https://doi.org/10.1007/BF01834040