9Migram P., Takemura H., Utsumi A., et al. Augmented reality: A class of displays on the reality-virtuality continuum[J]. Spie, 1994, 2351 (34): 282-292.
10Azuma R. T.. A survey of augmented reality [J]. Presence: Teleopera- tors and Virtual Environments, 1997, 6(4): 355-385.
