BOR, Serhat, et al. “The Comparsion of Teo Different Asophageal Motility Cathaters Recording Lower Esophageal Sphincter Pressure”. Turkish Journal of Gastroenterology, vol. 7, no. 1, Jan. 1996, pp. 49-52, https://turkjgastroenterol.org/index.php/tjg/article/view/682.