GerusO. F. “On the Modulus of Continuity of Solid Derivatives of a Cauchy-Type Integral”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 4 (April 25, 1998): 476–484. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4917.