LUBIS, R. A.; SIANTURI, F. A. Hepatitis Disease Diagnosis Expert System Using Certainty Factor: Hepatitis Disease Diagnosis Expert System Using Certainty Factor. Jurnal Mantik, [S. l.], v. 3, n. 3, p. 54-61, 2019. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/316. Acesso em: 19 jun. 2026.