J Mater Sci Technol ›› 1995, Vol. 11 ›› Issue (2): 109-113.
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Yaohua ZHU(Instituto de Investigaciones en Materials UNAM, Apdo P.70-360, Mexico D.F.04510, Mexico)Biao YAN and Wei HUANG(Dept. of Materials Science and Engineering, Tongji University, Shanghai 200092, China)