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Siegl, Petr; Stampach, Frantisek (2017). Spectral analysis of non-self-adjoint Jacobi operator associated with Jacobian elliptic functions. Operators and Matrices, 11(4), pp. 901-928. Element 10.7153/oam-2017-11-64
Radl, Agnes; Tretter, Christiane; Wagenhofer, Markus (2014). The block numerical range of analytic operator functions. Operators and Matrices, 8(4), pp. 901-934. Element 10.7153/oam-08-51