Ghassan. E. Arif , Alaa. M. F. AL. Jumaili, Abduljabar. K. Abbas. (2020). Another New Forms of Strongly and Quasi Mappings in Topological Spaces via δ-ß-Open Sets. PalArch’s Journal of Archaeology of Egypt / Egyptology, 17(9), 3867 - 3886. Retrieved from https://www.archives.palarch.nl/index.php/jae/article/view/4516