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http://pdn.sciencedirect.com/science?_ob=MiamiImageURL&_cid=271193&_user=38661&_pii=S0925477301005354&_check=y&_origin=article&_zone=toolbar&_coverDate=31-Dec-2001&view=c&originContentFamily=serial&wchp=dGLbVlB-zSkzS&md5=3c22a3cfb1bc94fd92eb199206695f81&pid=1-s2.0-S0925477301005354-main.pdf (Publisher version)
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