and Long Hongweib, 
来源:Acta Mathematica Scientia
Volume 29, Issue 3, May 2009, Pages 599-608
链接:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B82XD-4W85J4K-C&_user=1555633&_coverDate=05%2F31%2F2009&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1261894456&_rerunOrigin=google&_acct=C000053088&_version=1&_urlVersion=0&_userid=1555633&md5=ace16dd4b61f4d32f6c73f596000ef55


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