Mel’nichenko, I. P., and S. A. Plaksa. “Potential Fields With Axial Symmetry and Algebras of Monogenic Functions of Vector Variables. III”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 2 (February 25, 1997): 228–243. Accessed May 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5000.