Bodnar, D. I., and R. I. Dmytryshyn. “Multidimensional Associated Fractions With Independent Variables and Multiple Power Series”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 3 (March 25, 2019): 325–349. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1442.