Parkkonen, Jouni, and Frédéric Paulin. “A Classification of $\mathbb{C}$-Fuchsian Subgroups of Picard Modular Groups”. MATHEMATICA SCANDINAVICA 121, no. 1 (September 22, 2017): 57–74. Accessed December 4, 2024. https://www.mscand.dk/article/view/26128.