| article html file updated | 5 February 2020 23:49 CET | Update | https://www.mdpi.com/1424-8247/6/1/54 |
| article html file updated | 8 May 2019 10:14 CEST | Update | - |
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| article html file updated | 13 September 2013 17:16 CEST | Update | - |
| article xml file uploaded | 13 September 2013 17:16 CEST | Original file | https://www.mdpi.com/1424-8247/6/1/54/xml |
| article html file updated | 8 February 2013 09:22 CET | Update | - |
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| article html file updated | 24 January 2013 11:53 CET | Original file | - |