| article html file updated | 5 February 2020 19:06 CET | Update | https://www.mdpi.com/1999-4923/4/1/42 |
| article html file updated | 8 May 2019 21:01 CEST | Update | - |
| article html file updated | 25 March 2019 08:44 CET | Update | - |
| article html file updated | 16 June 2015 21:06 CEST | Update | - |
| article html file updated | 28 April 2014 11:04 CEST | Update | - |
| article xml file uploaded | 28 April 2014 11:04 CEST | Original file | https://www.mdpi.com/1999-4923/4/1/42/xml |
| article html file updated | 7 February 2013 09:44 CET | Update | - |
| article html file updated | 7 February 2013 00:15 CET | Update | - |
| article html file updated | 6 February 2013 05:32 CET | Update | - |
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| article html file updated | 26 January 2013 07:28 CET | Update | - |
| article html file updated | 23 January 2013 07:37 CET | Original file | - |
