http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VC6-4Y4XCW0-1&_user=10&_coverDate=05/31/2010&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=dc6d09cf0dbbbf1a70087154b62083e7
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