BERGGREN ULF 552,969 Laparoscopic biliary tract surgery in gallstone disease i an experimental, clinical and economic evaluation ; [doctoral dissertation] / by Ulf Berggren [Uppsala University]. - Uppsala ; Acta Universitatis Upsaliensis, 1997. - 99 s. ; wykr. ; 25 cm. - (Acta Universitatis Upsaliensis. Comprehensive Summaries of Uppsala Dissertation« from the Faculty of Medicine, ISSN 0282 176 ; 695) ISBN 91-554-3997-7