H. Abood, Eiman, Samira N. Kadhim, and Sarah M. Khalil. “The Spectrum and the Numerical Range of the Product of Finite Numbers of Automorphic Composition Operators on Hardy Space 2”. Iraqi Journal of Science 56, no. 4A (February 22, 2023): 2966–2971. Accessed January 3, 2026. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9534.