| article html file updated | 5 February 2020 20:30 CET | Update | https://www.mdpi.com/2227-7102/2/2/91 |
| article html file updated | 19 September 2019 10:35 CEST | Update | N/A |
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| article xml file uploaded | 14 August 2014 11:41 CEST | Update | https://www.mdpi.com/2227-7102/2/2/91/xml |
| article html file updated | 14 August 2014 11:21 CEST | Update | N/A |
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| article html file updated | 7 February 2013 12:25 CET | Update | N/A |
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| article html file updated | 29 January 2013 03:44 CET | Update | N/A |
| article html file updated | 26 January 2013 10:38 CET | Update | N/A |
| article html file updated | 23 January 2013 18:03 CET | Original file | N/A |
