Purnomo, A. A. N., Andryana, S. . and Iskandar, A. . (2020) “Application of Expert System for Diagnosing Gastric Disease Android Based with Certainty Factor Method”, Jurnal Teknik Informatika C.I.T Medicom, 12(1), pp. 7–15. doi: 10.35335/cit.Vol12.2020.17.pp7-15.