Purbayu, H. et al. 2007. Validation of 13C-urea Breath Test for the Diagnosis of Helicobacter pylori Infection Among Dyspeptic Patients at Dr Soetomo Hospital Surabaya. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy. 8, 3 (Jan. 2007), 76–79. DOI:https://doi.org/10.24871/83200776-79.