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Hochreiter, Werner W; Danuser, Hansjörg; Perrig, Martin; Studer, Urs E (2003). Extracorporeal shock wave lithotripsy for distal ureteral calculi: what a powerful machine can achieve. Journal of urology, 169(3), pp. 878-80. New York, N.Y.: Elsevier 10.1097/01.ju.0000051896.15091.0c