Holub, A. P., and L. O. Chernetska. “Two-Dimensional Generalized Moment Representations and Padé Approximations for Some Humbert Series”. Ukrains’kyi Matematychnyi Zhurnal 65, no. 10 (October 25, 2013): 1315–1331. Accessed April 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2511.