LIU Shengdian1, ZHANG Xiong2, HOU Guang2, ZHANG Yongde2
1. Department of Physics, Yantai Normal Institute, Yantai 264025, China;
2. Department of Modern Physics, University of Science and Technology of China, Hefei 230027, China
Received: 1997-08-02
Published: 1999-04-30
Funding Information:
The project partly supported by National Natural Science Foundation of China and partly by the Natural Science Foundation of Shandong Province
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