| article html file updated | 5 February 2020 15:11 CET | Update | https://www.mdpi.com/1999-4915/2/8/1621 |
| article html file updated | 9 May 2019 05:00 CEST | Update | - |
| article html file updated | 20 March 2019 02:14 CET | Update | - |
| article html file updated | 16 June 2015 11:08 CEST | Update | - |
| article html file updated | 14 August 2014 12:06 CEST | Update | - |
| article xml file uploaded | 14 August 2014 12:06 CEST | Original file | https://www.mdpi.com/1999-4915/2/8/1621/xml |
| article html file updated | 6 February 2013 18:17 CET | Update | - |
| article html file updated | 5 February 2013 22:18 CET | Update | - |
| article html file updated | 28 January 2013 19:50 CET | Update | - |
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| article html file updated | 22 January 2013 02:42 CET | Update | - |
| article html file updated | 18 January 2013 08:42 CET | Original file | - |
