Plaksa, S. A. “On Integral Representations of an Axisymmetric Potential and the Stokes Flow Function in Domains of the Meridian Plane. II”. Ukrains’kyi Matematychnyi Zhurnal, vol. 53, no. 6, June 2001, pp. 800-9, https://umj.imath.kiev.ua/index.php/umj/article/view/4300.