| article html file updated | 5 February 2020 19:27 CET | Update | https://www.mdpi.com/1424-8247/5/2/209 |
| article html file updated | 8 May 2019 20:18 CEST | Update | - |
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| article html file updated | 6 August 2013 16:02 CEST | Update | - |
| article xml file uploaded | 6 August 2013 16:02 CEST | Original file | https://www.mdpi.com/1424-8247/5/2/209/xml |
| article html file updated | 7 February 2013 10:32 CET | Update | - |
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| article html file updated | 26 January 2013 08:12 CET | Update | - |
| article html file updated | 23 January 2013 10:11 CET | Original file | - |
