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http://dx.doi.org/10.1016/0169-2046(87)90040-5DOI Link
http://www.sciencedirect.com/science/article/pii/0[...]10/08/2015 Item is within a limited-access website
http://ac.els-cdn.com/0169204687900405/1-s2.0-0169[...]10/08/2015 PDF Reader Item is within a limited-access website