%0 Journal Article %A $authorName.trim() %A $authorName.trim() %A $authorName.trim() %T %D 2011 %R %J Journal of Guilin University of Technology %P 221-224 %V 31 %N 2 %X %U http://manu28.magtech.com.cn/Jweb_gllg/EN/abstract/article_812.shtml