Kamal, A., and T.I. Yassen. “D-Metric Spaces and Composition Operators Between Hyperbolic Weighted Family of Function Spaces”. CUBO, A Mathematical Journal 22, no. 2 (August 22, 2020): 215–231. Accessed October 12, 2025. https://cubo.ufro.cl/index.php/cubo/article/view/2364.