Roring, Aprilia Adelina, Gilbert Josua Mangkay, Jean Stella Saragih, Ricat Abetnego Sundari, Jhosua Allesandro Tingon, Paul Aleksander Mundung, and Yulisa Aprianti. 2026. “Development of a Web-Based Expert System for Cancer and GERD Diagnosis”. Journal of Research and Investigation in Education 4 (2):58-63. https://doi.org/10.37034/residu.v4i2.233.