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2. Coelioscopic cholecystectomy;Dubois,1990
3. Laparoscopically directed appendectomy;Fleming;Australian and New Zealand Journal of Obstetrics and Gynaecology,1985
4. Laparoscopic appendectomy;Gangal;Endoscopy,1987
5. Percutaneous cholecystolithotomy;Kellett;Endoscopy,1989