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[13] http://www.sargentwelch.com
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[16] http://www.sciencestuff.com
[17] http://www.aspira.org/en/user/login?destination=comment/reply/487%23comment-form
[18] http://www.kn.pacbell.com/wired/bluewebn
[19] http://www.acs.ucalgary.ca/%7Edkbrown/index.html
[20] http://www.sbfonline.com
[21] http://www.sciencenetlinks.com