Vasileva, Yu. V., and S. A. Plaksa. 2006. “Piecewise-Continuous Riemann Boundary-Value Problem on a Rectifiable Curve”. Ukrains’kyi Matematychnyi Zhurnal 58 (5), 616–628. https://umj.imath.kiev.ua/index.php/umj/article/view/3480.