Contreras, M. D., S. Díaz-Madrigal, and Ch. Pommerenke. “On Boundary Critical Points for Semigroups of Analytic Functions”. MATHEMATICA SCANDINAVICA 98, no. 1 (March 1, 2006): 125–142. Accessed December 18, 2024. https://www.mscand.dk/article/view/14987.