Partyka, Dariusz, and Ken-ichi Sakan. “On Bi-Lipschitz Type Inequalities for Quasiconformal Harmonic Mappings”.
Annales Fennici Mathematici
32, no. 2 (August 1, 2007): 579–594. Accessed April 26, 2025. https://afm.journal.fi/article/view/135212.