Veri Arinal and Nuary Inaldi Simarmata 2025. Expert System For Diagnosing Brain Tumors Using the Certainty Factor (CF) Method. Repeater : Publikasi Teknik Informatika dan Jaringan. 3, 2 (Feb. 2025), 01–07. DOI:https://doi.org/10.62951/repeater.v3i2.387.