Bailleul , Maxime, and Vincent Devinck. “A Short Proof of the Boundedness of the Composition Operators on the Hardy Space H²”. North-Western European Journal of Mathematics, no. 9 (July 11, 2023): 101–108. Accessed October 18, 2024. https://nwejm.univ-lille.fr/index.php/nwejm/article/view/7.