SALAMA, A. A.; MOHAMED EISA; S.A.ELHAFEEZ; M. M. LOTFY. Review of Recommender Systems Algorithms Utilized in Social Networks based e-Learning Systems & Neutrosophic System. Neutrosophic Sets and Systems, [S. l.], v. 8, p. 32-41, 2015. Disponível em: http://fs.unm.edu/NSS2/index.php/111/article/view/488. Acesso em: 28 may. 2023.