Nakanishi, Toshihiro, and John A. Velling. “A Sufficient Condition for Teichmüller Spaces to Have Smallest Possible Inner Radii”. Annales Fennici Mathematici 18, no. 2 (August 1, 1993): 249–271. Accessed May 18, 2024. https://afm.journal.fi/article/view/134782.