| article html file updated | 5 February 2020 19:34 CET | Update | https://www.mdpi.com/2218-1989/2/1/221 |
| article html file updated | 8 May 2019 20:03 CEST | Update | - |
| article html file updated | 25 March 2019 09:36 CET | Update | - |
| article html file updated | 16 June 2015 21:59 CEST | Update | - |
| article html file updated | 7 January 2014 12:23 CET | Update | - |
| article xml file uploaded | 7 January 2014 12:23 CET | Update | https://www.mdpi.com/2218-1989/2/1/221/xml |
| article html file updated | 30 August 2013 09:13 CEST | Update | - |
| article xml file uploaded | 30 August 2013 09:12 CEST | Original file | - |
| article html file updated | 7 February 2013 10:48 CET | Update | - |
| article html file updated | 7 February 2013 00:54 CET | Update | - |
| article html file updated | 6 February 2013 06:17 CET | Update | - |
| article html file updated | 29 January 2013 01:57 CET | Update | - |
| article html file updated | 26 January 2013 08:27 CET | Update | - |
| article html file updated | 23 January 2013 11:07 CET | Original file | - |
