Veselovska, G.M., and A. P. Holub. “Existence Theorems for Multidimensional Generalized Moment Representations”. Ukrains’kyi Matematychnyi Zhurnal, vol. 69, no. 4, Apr. 2017, pp. 456-65, https://umj.imath.kiev.ua/index.php/umj/article/view/1709.