| article html file updated | 5 February 2020 18:50 CET | Update | https://www.mdpi.com/2071-1050/3/12/2456 |
| article html file updated | 8 May 2019 21:34 CEST | Update | - |
| article html file updated | 20 March 2019 11:23 CET | Update | - |
| article html file updated | 16 June 2015 20:33 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/2071-1050/3/12/2456/xml |
| article html file updated | 6 February 2013 23:51 CET | Update | - |
| article html file updated | 6 February 2013 05:00 CET | Update | - |
| article html file updated | 29 January 2013 00:55 CET | Update | - |
| article html file updated | 26 January 2013 06:51 CET | Update | - |
| article html file updated | 23 January 2013 05:22 CET | Original file | - |
