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Gigot, J. F.; Navez, B.; Etienne, J.; Cambier, E.; Jadoul, P.; Guiot, P.; Kestens, P. J.. (1997). A stratified intraoperative surgical strategy is mandatory during laparoscopic common bile duct exploration for common bile duct stones. , 11(7), 722–728. doi:10.1007/s004649900436 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research