3Sofer M, Watterson J D, Wollin T A, et al. Holmium:YAG laser lithotripsy for upper urinary tract calculi in 598 patients[J]. J Urol, 2002,167:31-34.
4Yagisawa T, Kobayashi C, Ishikawa N, et al. Benefits of ureteroscopic pneumatic lithotripsy for the treatment of impacted ureteral stones[J]. J Endoural, 2001, 15:697-699.