SavchukV. V. “Representation of Holomorphic Functions of Many Variables by Cauchy-Stieltjes-Type Integrals”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 58, no. 4, Apr. 2006, pp. 522–542, https://umj.imath.kiev.ua/index.php/umj/article/view/3471.