Lubis, Rabiatul Adawiyah, and Fricles Ariwisanto Sianturi. “Hepatitis Disease Diagnosis Expert System Using Certainty Factor: Hepatitis Disease Diagnosis Expert System Using Certainty Factor”. Jurnal Mantik 3, no. 3 (November 1, 2019): 54-61. Accessed July 30, 2026. https://www.ejournal.iocscience.org/index.php/mantik/article/view/316.