Journal of Zhejiang University-SCIENCE A
Journal of Zhejiang University-SCIENCE A > 2002 > 3 > 4 > 395-400
Journal of Zhejiang University-SCIENCE A > 2002 > 3 > 4 > 435-439
Journal of Zhejiang University-SCIENCE A > 2002 > 3 > 4 > 440-444
Journal of Zhejiang University-SCIENCE A > 2002 > 3 > 4 > 418-425