“On Еc-Continuous and δ-ßc-Continuous Mappings in Topological Spaces Via Еc-Open and δ-ßc-Open Sets”. Iraqi Journal of Science 63, no. 7 (July 31, 2022): 3120–3134. Accessed July 26, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/3070.