The numerical range of a nonnegative matrix

Berman, 1994, vol. 9 Chien, 1994, Circularity of the numerical range, Linear Algebra Appl., 201, 113, 10.1016/0024-3795(94)90110-4 Dritschel, 1997, Model theory and linear extreme points in the numerical radius unit ball, Memoirs Amer. Math. Soc., 129, 615, 10.1090/memo/0615 Embry, 1970, The numerical range of an operator, Pacific J. Math., 32, 647, 10.2140/pjm.1970.32.647 Fiedler, 1981, Geometry of the numerical range of matrices, Linear Algebra Appl., 37, 81, 10.1016/0024-3795(81)90169-5 Gustafson, 1996 Goldberg, 1982, On the numerical radius and its applications, Linear Algebra Appl., 42, 263, 10.1016/0024-3795(82)90155-0 Horn, 1985 Horn, 1991 J.N. Issos, The field of values of non-negative irreducible matrices, Ph.D. thesis, Auburn University, 1966 Minc, 1988 Nylen, 1991, Numerical range of a doubly stochastic matrix, Linear Algebra Appl., 153, 161, 10.1016/0024-3795(91)90216-J Pták, 1976, Isometric parts of an operator and the critical exponent, Časopis Pěst. Mat., 101, 383, 10.21136/CPM.1976.117923 Tam, 1994, Circularity of numerical ranges and block-shift matrices, Linear and Multilinear Algebra, 37, 93, 10.1080/03081089408818314 Tam, 1999, On matrices with cyclic structure, Linear Algebra Appl., 302–303, 377, 10.1016/S0024-3795(99)00097-X Tam, 1999, On matrices whose numerical ranges have circular or weak circular symmetry, Linear Algebra Appl., 302–303, 193, 10.1016/S0024-3795(99)00174-3 Wielandt, 1950, Unzerlegbare, nicht negative matrizen, Math. Z., 52, 642, 10.1007/BF02230720