| article html file updated | 5 February 2020 20:40 CET | Update | https://www.mdpi.com/1424-8247/5/6/591 |
| article html file updated | 8 May 2019 17:37 CEST | Update | - |
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| article html file updated | 6 August 2013 16:05 CEST | Update | - |
| article xml file uploaded | 6 August 2013 16:05 CEST | Original file | https://www.mdpi.com/1424-8247/5/6/591/xml |
| article html file updated | 7 February 2013 12:40 CET | Update | - |
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| article html file updated | 26 January 2013 10:57 CET | Update | - |
| article html file updated | 23 January 2013 19:05 CET | Original file | - |
