1) http://baike.baidu.com/view/278116.htm 2) http://www.huaxia.com/hxhy/hybh/2012/12/3121316.html 3 http://www.bjkp.gov.cn/gkjqy/hykx/k20333-02.htm 4) http://www.xjkp.xjinfo.gov.cn/news show.asp?newsid=50340 5)http://detail.bookuu.com/1404676.html 6) http://baike.baidu.com/view/834804.htm ) http://science.kexue.com/2012/0711/23293.html 8) http://www.cusdn.org.cn/news detail.php?id=226315 9) http://baike.baidu.com/view/284716.htm1) http://baike.baidu.com/view/278116.htm 2) http://www.huaxia.com/hxhy/hybh/2012/12/3121316.html 3) http://www.bjkp.gov.cn/gkjqy/hykx/k20333-02.htm 4) http://www.xjkp.xjinfo.gov.cn/news_show.asp?newsid=50340 5) http://detail.bookuu.com/1404676.html 6) http://baike.baidu.com/view/834804.htm 7) http://science.kexue.com/2012/0711/23293.html 8) http://www.cusdn.org.cn/news_detail.php?id=226315 9) http://baike.baidu.com/view/284716.htm