Mel’nichenkoI. P., and PlaksaS. A. “Potential Fields With Axial Symmetry and Algebras of Monogenic Functions of a Vector Variable. II”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 48, no. 12, Dec. 1996, pp. 1695-03, https://umj.imath.kiev.ua/index.php/umj/article/view/5191.