Derkach, V. A. (2003) “On Schur–Nevanlinna–Pick Indefinite Interpolation Problem”, Ukrains’kyi Matematychnyi Zhurnal, 55(10), pp. 1299-1315. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4004 (Accessed: 19May2024).