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http://www.sciencedirect.com/
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http://ieeexplore.ieee.org/
http://ieeexplore.ieee.org/
http://search.ebscohost.com/
http://onlinelibrary.wiley.com/
http://dl.acm.org/
http://journals.cambridge.org/
http://proquest.umi.com/
http://www.oxfordjournals.com/
http://www.metapress.com/
http://www.emeraldinsight.com/
http://www.scopus.com/scopus/home.url
http://www.jstor.org