Peng Wan, Chen Hua, Ouyang Guan, Xu Junwu, Shi Zhangxi, Liang Heqing, Yuan Heying, Ren Hongwei, Tan Yushan, Zheng Wen. Study or maxillary bilateral rree-end removable partial denture connectors by means of holographic interfermetry[J]. Chinese Journal of Lasers, 1989, 16(8): 509