1. Japanese Research Society for Esophageal Diseases and National Cancer Center, Tokyo. The Report of Esophageal Carcinoma Registration in Japan, vol. 2. Tokyo: National Cancer Center, 1980 (in Japanese).
2. Japanese Research Society for Esophageal Diseases and National Cancer Center, Tokyo. The Report of Esophageal Carcinoma Registration in Japan, vol. 9. Tokyo: National Cancer Center, 1988 (in Japanese).
3. Superficial carcinoma of the esophagus
4. Superficial esophageal carcinoma: a report of 12 cases
5. Minute lesions of esophageal cancer