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Carpenter MA, Buckley A, Taylor PA, McKnight RE, Darling TW.Carpenter MA, et al.J Phys Condens Matter. 2010 Jan 27;22(3):035406. doi: 10.1088/0953-8984/22/3/035406. Epub 2009 Dec 21.J Phys Condens Matter. 2010.PMID: 21386289