2Choi C, Han H, An B. Development of a surgical simulator for la-paroscopic esophageal procedures[J]. Conf Proc IEEE Eng Med Biol Soc, 2006(1):819-822.
3Wang P, Becker AA, Jones IA, et al. A virtual reality surgery sim-ulation of cutting and retraction in neurosurgery with force-feed-back[J]. Computer Methods and Programs in Biomedicine, 2006, 84(1):11-18.