您要访问的是其他网站的链接,不能确定是否安全。
继续访问请点击:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJ4-4W68DVG-9&_user=10&_coverDate=12%2F15%2F2009&_rdoc=3&_fmt=high&_orig=browse&_srch=doc-info%28%23toc%235300%232009%23999579994%231396064%23FLA%23display%23Volume%29&_cdi=5300&_sort=d&_docanchor=&_ct=80&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=c515bbae45549020c46ecabf0dac922f