Latif, Shaimia Qais, and Salwa Salman Abed. “Types of Fixed Points of Set-Valued Contraction Mappings for Comparable Elements”. Iraqi Journal of Science (May 17, 2020): 190–195. Accessed June 22, 2026. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/2245.