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Science Direct. (2008). Accessed January 16, 2008, from
http://0-www.sciencedirect.com.innopac.up.ac.za/science?_ob=BrowseListURL&_type=subject& subjColl=14& zone=brws&_acct=C000005298&_version=1&_urlVersion=0&_userid=59388& md5=6dcfe4cc6b2182dfdade5ff066154ef0
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