D. I. Bodnar and R. I. Dmytryshyn, “Multidimensional associated fractions with independent variables and multiple power series”, Ukr. Mat. Zhurn., vol. 71, no. 3, pp. 325–349, Mar. 2019, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1442