PUTRA, M Zaki; SYAHRA, Yohanni. Expert System for Diagnosing Rheumatoid Arthritis (RA) in the Elderly Using the Certainty Factor Method. International Journal of Educational Technology Research, [S. l.], v. 4, n. 3, p. 217–226, 2026. DOI: 10.59890/ijetr.v4i3.14. Disponível em: https://journalijetr.my.id/index.php/ijetr/article/view/14. Acesso em: 10 oct. 2026.