βThe Spectrum and the Numerical Range of the Product of Finite Numbers of Automorphic Composition Operators on Hardy Space ο2β.
Iraqi Journal of Science 56, no. 4A (February 22, 2023): 2966β2971. Accessed August 11, 2025.
https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9534.