http://leiden.dachs-archive.org/archive/citrep/vancrevel2008/20080220/www.chinesepen.org/Article/hyxz/200604/Article_20060404173644.shtml http://leiden.dachs-archive.org/archive/citrep/vancrevel2008/20080220/www.chinesepen.org/Article/hyxz/200604/Article_20060404173644.shtml http://leiden.dachs-archive.org/archive/citrep/vancrevel2008/20080220/www.chinesepen.org/Article/hyxz/200604/Article_20060404173644.shtml