TARIGAN, E. B. Expert System for Diagnosis of Pests and Diseases of Citrus Plants using the Certainty Factor Method (Case Study in Deram Village, Karo Regency). International Journal of Basic and Applied Science, [S. l.], v. 10, n. 1, p. 9–15, 2021. DOI: 10.35335/ijobas.v10i1.1. Disponível em: https://www.ijobas.pelnus.ac.id/index.php/ijobas/article/view/1. Acesso em: 16 apr. 2026.