Farah Amer, Qasim Mohammed Hussein, and Mohammed Sahib Mahdi Altaei. “Retrieving E-Learning Document Using Encrypted Semantic Words”. Journal of Madenat Alelem University College, Vol. 14, no. 3, Sept. 2022, pp. 17-23, https://journal.mauc.edu.iq/index.php/JMAUC/article/view/454.