Dr. Miguel Caldas, Dr.SaeidJafari, Dr.Raja Mohammad Latif, Dr.Arafa A. Nasef 2021. ON A CLOSURE SPACE VIA SEMI-CLOSURE OPERATOR. Turkish Journal of Computer and Mathematics Education (TURCOMAT). 12, 14 (Dec. 2021), 5447–5445. DOI:https://doi.org/10.17762/turcomat.v12i14.11656.