ÖZDEN, A., Ö. KOÇ, B. YEŞİLDAĞ, M.K. BALCI, and E. BAŞPINAR. 1993. “Hydrogen Gas Production in Turkish Population”. Turkish Journal of Gastroenterology 4 (3):549-51. https://www.turkjgastroenterol.org/index.php/tjg/article/view/305.