Journal of Shanghai University(Natural Science Edition) ›› 2011, Vol. 17 ›› Issue (4): 438-446.doi: 10.3969/j.issn.1007-2861.2011.04.011
• Mathematics.Physics and Chemistry • Previous Articles Next Articles
ZHAO Xin-luo1,2,YU Li-ming1,2,SHENG Lei-mei1,2,AN Kang1,2