S. BOR, O. TEKEŞİN, H. YÜCEYAR, N. YÖNETÇİ, and H. ÇAVUŞOĞLU, “The comparsion of teo different asophageal motility cathaters recording lower esophageal sphincter pressure”, Turkish Journal of Gastroenterology, vol. 7, no. 1, pp. 49–52, Jan. 1996.