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222 NOT ok, but the url belowing for other contributors: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TG8-48V1GJ4-C-10&_cdi=5248&_user=2845280&_orig=browse&_coverDate=06%2F06%2F2003&_sk=989999998&view=c&wchp=dGLzVlz-zSkWA&md5=98e6c1aa19b85462a6a6c30dea8b5bbf&ie=/sdarticle.pdf
333 also NOT ok. 链接如下: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TG8-4NP983D-3-1&_cdi=5248&_user=2845280&_orig=browse&_coverDate=07%2F20%2F2007&_sk=988429998&view=c&wchp=dGLbVlb-zSkWW&md5=dc8c150590181be1043afca7da3a6c28&ie=/sdarticle.pdf