1. Operative choledochoscopy using an experimental choledochoscope;Ashby;Gut,1976
2. Operative choledochoscopy;Ashby;Hospital Update,1977
3. Fiberoptic choledochoscopy in common bile duct surgery;Ashby;Annals of the Royal College of Surgeons of England,1978
4. Die choledochopapilloskopie;Bakes;Archiv für klinische Chirurgie,1923
5. Choledochoscopy;Berci;Medical Journal of Australia,1961