Salama AA, Mohamed Eisa, S.A.ELhafeez, M. M. Lotfy. Review of Recommender Systems Algorithms Utilized in Social Networks based e-Learning Systems & Neutrosophic System. NSS [Internet]. 2015May5 [cited 2023May29];8:32-41. Available from: http://fs.unm.edu/NSS2/index.php/111/article/view/488