›› 1999, Vol. 31 ›› Issue (04): 390-396.
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Sun Pei; Han Buxin; Sun Xiuru(Institute of Psychology, Chinese Academy of sciences, Beijing, 100101)Zeng Xiaodong(National Institute of Metrology Beijing, 100013)He Jichang(The Schepens Eye Research Institute, Harvard Medical School MA02114 USA)