Challenges 2012, 3(2), 290-318; doi:10.3390/challe3020290

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Article Published19 December 2012 16:10 CET
article html file updated24 January 2013 11:34 CET
article supplementary file uploaded.5 February 2013 16:48 CET
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Article Edited21 February 2013 18:24 CET
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