Zagorodnyuk, S. M. “Integral Representations for Spectral Functions of Some Nonself-Adjoint Jacobi Matrices”. Methods of Functional Analysis and Topology 15, no. 1 (March 25, 2009): 91–100. Accessed December 16, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/412.