HolubA. P., PozharskiyO. A., and ChernetskaL. O. “Generalized Moment representations and Multivariate Multipoint Padé-Type Approximants”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 71, no. 10, Oct. 2019, pp. 1331-46, https://umj.imath.kiev.ua/index.php/umj/article/view/1518.