Dudkin, M. Ye., and V. I. Kozak. 2016. “Jacobi-Type Block Matrices Corresponding to the Two-Dimensional Moment Problem: Polynomials of the Second Kind and Weyl Function”. Ukrains’kyi Matematychnyi Zhurnal 68 (4), 495-505. https://umj.imath.kiev.ua/index.php/umj/article/view/1855.