| article html file updated | 5 February 2020 17:29 CET | Update | https://www.mdpi.com/1660-4601/8/6/2240 | 
| article html file updated | 9 May 2019 00:25 CEST | Update | - | 
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| article xml file uploaded | 14 August 2014 12:04 CEST | Update | https://www.mdpi.com/1660-4601/8/6/2240/xml | 
| article html file updated | 14 August 2014 11:42 CEST | Update | - | 
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| article html file updated | 6 February 2013 21:27 CET | Update | - | 
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| article html file updated | 28 January 2013 22:43 CET | Update | - | 
| article html file updated | 26 January 2013 03:04 CET | Update | - | 
| article html file updated | 22 January 2013 17:37 CET | Original file | - |