GÜLŞEN, Mustafa, et al. “THE COMPARISON OF BERNSTEIN TEST RESULTS WITH ENDOSCOPIC AND HISTOPATHOLOGIC EXAMINATION IN PATIENTS WITH GASTROESOPHAGEAL REFLUX DISEASE (GERD)”. Turkish Journal of Gastroenterology, vol. 5, no. 1, Jan. 1994, pp. 49-53, https://www.turkjgastroenterol.org/index.php/tjg/article/view/396.