Bennion, R., Wyatt, L., & JE, T. , Jr. (1969). Effect of intraoperative cholangiography during cholecystectomy on outcome after gallstone pancreatitis. Journal of Gastrointestinal Surgery : Official Journal of the Society for Surgery of the Alimentary Tract, 6(4), 575-81. https://doi.org/10.1016/s1091-255x(01)00017-8 (Original work published 1969)