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2. Clinical application of ultra-thin cholangiopancreatoscope [in Japanese];Tajiri;Gastroenterol Endosc,1989
3. Endoscopic diagnosis of pancreatic cancer [in Japanese];Takagi;Stom Intes,1974
4. Retrograde pancreatocholangioscopy [in Japanese];Takegoshi;Gastroenterol Endosc,1975
5. The research of transduodenoscopic pancreatocholedochoscopy [in Japanese];Nakamura;Gastroenterol Endosc,1976