http://nsgl.gso.uri.edu/nsglc/nsglch10001.pdf
http://etda.libraries.psu.edu/theses/approved/WorldWide
Index/ETD-5819/index.html
http://pubs.acs.org/doi/abs/10.1021/es903811p
http://ezaccess.libraries.psu.edu/login?url=http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=59215949&site=ehost-live
http://docs.newsbank.com/s/InfoWeb/aggdocs/AWNB/136178E863AAFF28/0EB90CA9CF65E92A?p_multi=PPGB&s_lang=en-US
http://docs.newsbank.com/s/InfoWeb/aggdocs/AWNB/135A8E901072FBB8/0EB90CA9CF65E92A?p_multi=PPGB&s_lang=en-US
http://docs.newsbank.com/s/InfoWeb/aggdocs/AWNB/135B399121DDAD80/0EB90CA9CF65E92A?p_multi=PPGB&s_lang=en-US
http://library.cqpress.com/cqresearcher/cqresrre2010061802
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