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[1] M. T. Chien and Kuo-Chih Hung, Elliptical property of numerical range, preprint. [2] M. T. Chien, On the numerical range of tridiagonal operators, Linear Algebra and Its Application, 246(1996), 203-214. [3] M. T. Chien, L. Yeh, Y. T. Yeh, and F. Z. Lin, On geometric properties of the numerical, Linear Algebra and Its Application, 274(1998), 389-410. [4] M. T. Chien and B. S. Tam,Circularity of numerical range, Linear Algebra and Its Application, 201(1994), 113-133.
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