A. Luger and S. Hassi, “Generalized zeros and poles of $\mathcal N_\kappa$-functions: on the underlying spectral structure”, MFAT, vol. 12, no. 2, pp. 131–150, Jun. 2006, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/308