Efficiacy of second generation lithotriptors: A multicenter comparative study of 2,206 extracorporeal shock wave lithotripsy treatments with the Siemens Lithostar, Dornier HM 4, Wolf Piezolith 2300, Direx Tripter X-1 and Breakstone Lithotriptors. - Bierkens,AF.; Hendrikx,AJM.; de,VJW.Kort. (J Urol, 1992)