Plaksa, S. A. (2005). Differentiation of Singular Integrals with Piecewise-Continuous Density and Boundary Values of Derivatives of a Cauchy-Type Integral. Ukrains’kyi Matematychnyi Zhurnal, 57(2), 222–229. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3589