1. Abukhadir, B. A., Heneghan, M. A., Kearns, M., Little, C. L., & McCarthy, C. F. (1998). Evaluation of a 20 minute C-14 urea breath test for the diagnosis of Helicobacter pylori infection. Irish Med J, 91(1), 23–25.
2. Bazzoli, F., Zagari, M., Fossi, S., Pozzato, P., Ricciardiello, L., Mwangemi, C., Roda, A., & Roda, E. (1997). Urea breath tests for the detection of Helicobacter pylori infection. Helicobacter, 2, S34–S37.
3. Bazzoli, F., Cecchini, L., Corvaglia, L., Dall’Antonia, M., De Giacomo, C., Fossi, S., Casali, L. G., Gullini, S., Lazzari, R., Leggeri, G., Lerro, P., Valdambrini, V., Mandrioli, G., Marani, M., Martelli, P., Miano, A., Nicolini, G., Oderda, G., Pazzi, P., Pozzato, P., Ricciardiello, L., Roda, E., Simoni, P., Sottili, S., Torre, G., Urso, L., & Zagari, R. M. (2000). Validation of the C-13-urea breath test for the diagnosis of Helicobacter pylori infection in children: a multicenter study. Am J Gastroenterol, 95(3), 646–650.
4. Braden, B., Caspary, W. F., & Lembcke, B. (1999). Nondispersive infrared spectrometry for (CO2)-C-13/(CO2)-C-12-measurements: a clinically feasible analyzer for stable isotope breath tests in gastroenterology. Zeitschrift Fur Gastroenterologie, 37(6), 477–481.
5. Braden, B., Gelbmann, C., Dietrich, C. F., Caspary, W. F., Scholmerich, J., & Lock, G. (2001). Qualitative and quantitative clinical evaluation of the laser-assisted ratio analyser for detection of Helicobacter pylori infection by C-13-urea breath tests. Eur J Gastroenterol Hepatol, 13(7), 807–810.