RAJAGOPAL, Raji; BASKARAN, S. Ontology Based E-Learning Systems in the Semantic Web. International Journal of Computer (IJC), Jordan, v. 6, n. 1, p. 1–8, 2012. DOI: 10.53896/ijc.v6i1.77. Disponível em: https://www.ijcjournal.org/InternationalJournalOfComputer/article/view/77. Acesso em: 29 oct. 2025.