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

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article html file updated 24 January 2013 11:34 CET Original file -
Correction published 5 February 2013 00:00 CET Correction http://www.mdpi.com/2078-1547/4/1/17
article supplementary file uploaded. 5 February 2013 16:48 CET - http://www.mdpi.com/2078-1547/3/2/290#supplementary
article html file updated 7 February 2013 17:34 CET Update -
article html file updated 17 June 2015 04:56 CEST Update http://www.mdpi.com/2078-1547/3/2/290/html
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