上海大学学报(自然科学版) ›› 2007, Vol. 13 ›› Issue (6): 674-678 .
张俊杰1,毛群凌1,王砚方2
ZHANG Jun-jie1,MAO Qun-ling1,WANG Yan-fang2
1. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China;
2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China