Mọi người giúp mình mấy bài này với
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T99-526MS9F-1&_user=10&_coverDate=02/18/2011&_alid=1680759689&_rdoc=3&_fmt=high&_orig=search&_origin=search&_zone=rslt_list_item&_cdi=5109&_sort=r&_st=13&_docanchor=&view=c&_ct=7&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=6a30bec7abfbd7f5c1442e35f26b6a68&searchtype=a
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T0M-50DYGXS-3&_user=10&_coverDate=10/31/2010&_alid=1680757187&_rdoc=10&_fmt=high&_orig=search&_origin=search&_zone=rslt_list_item&_cdi=4866&_st=13&_docanchor=&view=c&_ct=10&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=56753d5650c6285292f35ab1a5db90f9&searchtype=a
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T8D-50BB5D7-7&_user=10&_coverDate=08/19/2010&_alid=1680807204&_rdoc=2&_fmt=high&_orig=search&_origin=search&_zone=rslt_list_item&_cdi=5084&_sort=r&_st=13&_docanchor=&view=c&_ct=41&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=09dd6abeddc6ad0c88db358dc40c6378&searchtype=a
Cám ơn mọi người nhiều
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T99-526MS9F-1&_user=10&_coverDate=02/18/2011&_alid=1680759689&_rdoc=3&_fmt=high&_orig=search&_origin=search&_zone=rslt_list_item&_cdi=5109&_sort=r&_st=13&_docanchor=&view=c&_ct=7&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=6a30bec7abfbd7f5c1442e35f26b6a68&searchtype=a
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T0M-50DYGXS-3&_user=10&_coverDate=10/31/2010&_alid=1680757187&_rdoc=10&_fmt=high&_orig=search&_origin=search&_zone=rslt_list_item&_cdi=4866&_st=13&_docanchor=&view=c&_ct=10&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=56753d5650c6285292f35ab1a5db90f9&searchtype=a
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T8D-50BB5D7-7&_user=10&_coverDate=08/19/2010&_alid=1680807204&_rdoc=2&_fmt=high&_orig=search&_origin=search&_zone=rslt_list_item&_cdi=5084&_sort=r&_st=13&_docanchor=&view=c&_ct=41&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=09dd6abeddc6ad0c88db358dc40c6378&searchtype=a
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