Holub, A. P. “Many-Dimensional Generalized Moment Representations and Padé -Type Approximants for Functions of Many Variables”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 66, no. 9, Sept. 2014, pp. 1166–1174, https://umj.imath.kiev.ua/index.php/umj/article/view/2207.