Tonoyan, Ye.G. “ON INTEGRAL OPERATORS OF BERGMAN TYPE ON THE UNIT BALL OF ${\mathbb R}^n$”. Proceedings of the YSU A: Physical and Mathematical Sciences 49, no. 3 (238) (December 15, 2015): 23–30. Accessed May 19, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol49_no3_2015_pp023-030.