S. A. Daulay, S. Subagio, and W. A. Ritonga, “EXPERT SYSTEM TO DIAGNOSE DISEASES IN THE HUMAN DIGESTIVE SYSTEM USING THE FORWARD CHAINING METHOD CASE STUDY OF PUSKESMAS HUTAGODANG HEALTH CENTER”, u-net, vol. 8, no. 2, pp. 22-28, Mar. 2025.