ZHANG Fu-Chun, ZHANG Zhi-Yong, ZHANG Wei-Hu, YAN Jun-Feng, YUN Jiang-Ni
2008, Vol. 66(16): 1863-1868
(a Xi’an Institute of Optics and Precision Mechanics, Acadecmia sinicChinse Academy of Sciencesa, Xi’an 710068)
(b College of Physics & Electronic Information, Yan’an University, Yan’an 716000)
(c Information sScience and tTechnology Institution, Northwest University, Xi’an 710127)