Salama, A. A., Mohamed Eisa, S.A.ELhafeez, and M. M. Lotfy. “Review of Recommender Systems Algorithms Utilized in Social Networks Based E-Learning Systems & Neutrosophic System”. Neutrosophic Sets and Systems 8 (May 5, 2015): 32-41. Accessed June 9, 2023. https://fs.unm.edu/NSS2/index.php/111/article/view/488.