GryshchukS. V., and PlaksaS. A. “Integral Representations of Generalized Axially Symmetric Potentials in a Simply Connected Domain”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, no. 2, Feb. 2009, pp. 160-77, https://umj.imath.kiev.ua/index.php/umj/article/view/3012.