URLDate
Verified		Extra Software
Requirements
(if any)		Access
Conditions		Notes
http://dx.doi.org/10.1046/j.1469-8137.1997.00616.xDOI Link
http://www.jstor.org/stable/view/2558658 10/22/2013 Item is within a limited-access website
http://www.jstor.org/stable/pdfplus/2558658.pdf 10/22/2013 PDF Reader Item is within a limited-access website