| article html file updated | 5 February 2020 20:24 CET | Update | https://www.mdpi.com/2077-0375/2/2/216 |
| article html file updated | 8 May 2019 18:11 CEST | Update | - |
| article html file updated | 25 March 2019 11:10 CET | Update | - |
| article html file updated | 16 June 2015 23:51 CEST | Update | - |
| article html file updated | 18 March 2014 09:48 CET | Update | - |
| article xml file uploaded | 18 March 2014 09:48 CET | Original file | https://www.mdpi.com/2077-0375/2/2/216/xml |
| article html file updated | 7 February 2013 12:17 CET | Update | - |
| article html file updated | 7 February 2013 02:15 CET | Update | - |
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| article html file updated | 29 January 2013 03:29 CET | Update | - |
| article html file updated | 26 January 2013 10:26 CET | Update | - |
| article html file updated | 23 January 2013 17:32 CET | Original file | - |
