paper help, thank you# Chemistry - 化学
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http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T32-4BVP8BS-7&_user=29441&_coverDate=06%2F15%2F2004&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1260227634&_rerunOrigin=google&_acct=C000003858&_version=1&_urlVersion=0&
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8G3Y-4W4BV61-9&_user=29441&_coverDate=04%2F23%2F2009&_fmt=high&_orig=browse&_sort=d&view=c&_acct=C000003858&_version=1&_urlVersion=0&_userid=29441&md5=a1193c71b65a486ccef307178bd89f61
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http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8G3Y-4W4BV61-9&_user=29441&_coverDate=04%2F23%2F2009&_fmt=high&_orig=browse&_sort=d&view=c&_acct=C000003858&_version=1&_urlVersion=0&_userid=29441&md5=a1193c71b65a486ccef307178bd89f61
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