1. Yokoyama I, Kozuka S, Ito K, Yokoyama Y, Kubota K, Kondo T. Gastric gland metaplasia in the small and large intestine. Gut 1977; 18: 214–218.
2. Yokoyama I, Anselmo MT, Najmi J, Islami AH. Gastric gland metaplasia after jejunoileal by-pass surgery for morbid obesity. Am J Gastroenterol 1980; 73: 341–344.
3. Yokoyama I, Kozuka S, Ito K, Kondo T, Ohta K. Gastric gland metaplasia in the ilial blind loop. I to Cho (Stom Intest) 1977; 12: 659–662. (Engl. Abstr.)
4. Sternberger LA. Immunocytochemistry. Second ed. New York: John Wiley & Sons, Inc., 1979; 104–169.
5. Yanaihara C, Yanaihara N, Shimizu F, Sato H, Uehata S, Imagawa K. A new type of gastrin derivative and its use for production of central region-specific antigastrin sera. Biomed Res 1980; 1: 242–247.