Acta Physica Sinica
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Acta Phys. Sin.  1995, Vol. 44 Issue (3): 498-504    
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS Current Issue| Next Issue| Archive| Adv Search  |   
Zhao Zheng1, Yang Shu-Zheng2
(1)北京师范大学物理系,北京100875; (2)四川师范学院物理系,南充637002;
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