1. Savary M, Miller G: The Esophagus. Handbook and Atlas of Endoscopy. Solothurn, Gassmann AG, 1978
2. Tanaka Y, Yasuda K, Aibe T, Fuji T, Kawai K: Anatomical and pathological aspects in ultrasonic endoscopy for G-I tract. Scand J Gastroenterol 94:43–50, 1984
3. Yasuda K, Nakajima M, Kawai K: Endoscopic ultrasonography in the diagnosis of submucosal tumor of the upper digestive tract. Scand J Gastroenterol 123:60–67, 1986
4. Nakazawa S, Segawa K, Yamanaka T, Yoshino J, Nakamura T, Morita K, Ohta H, Yamao K: Evaluation of endoscopic ultrasonography on the histological diagnosis of gastric ulcer. Curr Ther Res 40:604–612, 1986
5. Dent J, Chir B: A new technique for continuous sphincter pressure measurement. Gastroenterology 71:263–267, 1976