Arinal, Veri, and Nuary Inaldi Simarmata. “Expert System for Diagnosing Brain Tumors Using the Certainty Factor (CF) Method”. Jurnal JTIK (Jurnal Teknologi Informasi dan Komunikasi) 9, no. 3 (July 1, 2025): 1010–1015. Accessed June 4, 2026. https://journal.lembagakita.com/jtik/article/view/3825.