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 (Mar. 2020), 7–15. DOI:https://doi.org/10.35335/cit.Vol12.2020.17.pp7-15.