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http://dx.doi.org/10.1111/j.1365-2494.1983.tb01645.xDOI Link
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-[...]04/02/2012PDF ReaderItem is within a limited-access website
http://web.ebscohost.com/ehost/viewarticle?data=dG[...]04/02/2012PDF ReaderItem is within a limited-access website