Nhờ anh chị lấy hộ em bài này http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B85G6-4NXBC3X-5&_user=10&_origUdi=B85TN-4PB2KDS-D&_fmt=high&_coverDate=05%2F12%2F2007&_rdoc=1&_orig=article&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=486d4f75552aed15405faa5163a536fd
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