Schiffer, M. M., and G. Schober. “Representation of Fundamental Solutions for Generalized Cauchy-Riemann Equations by Quasiconformal Mappings”. Annales Fennici Mathematici 2, no. 1 (February 1, 1976): 501–531. Accessed November 25, 2024. https://afm.journal.fi/article/view/134311.