Acta Metallurgica Sinica (English Letters) ›› 1999, Vol. 12 ›› Issue (4): 474-476.
• Research paper • Previous Articles Next Articles
Y.M.Hao1) and Y.Gao2) 1)Department of Physics, Tianjin Normal University, Tianjin 300074 ,China 2)Library ,Tianjin Normal University, Tianjin 300074 ,China