Sokal, E., De Bilderling, G., Clapuyt, P., Opsomer, R.-J., & Buts, J.-P. (1994). Extracorporeal shock-wave lithotripsy for calcified lower choledocholithiasis in an 18-month-old boy. Journal of Pediatric Gastroenterology and Nutrition, 18(3), 391-394. https://doi.org/10.1097/00005176-199404000-00024 (Original work published 1994)