1. Endoscopic papillotomy: spincterotomy or sphincteroplasty;Siegel;Am J Gastroenterol,1979
2. Biliary endoprostheses for the management of retained common duct stones;Siegel;Am J Gastroenterol,1984
3. Endoscopic sterling for long-term treatment of large common duct stones: 2-5 year follow-up;Cotton;Gastrointest Endosc,1987
4. Endoscopic sphincterotomy: when is it appropriate?;Siegel,1989
5. Endoscopic electrohydraulic disintegration of common bile duct concrements;Manegold,1982