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http://dx.doi.org/10.1046/j.1469-8137.2001.00069.xDOI Link
http://www.jstor.org/stable/view/135363407/16/2014Item is within a limited-access website
http://www.jstor.org/stable/pdfplus/1353634.pdf07/16/2014PDF ReaderItem is within a limited-access website