| article html file updated | 5 February 2020 15:05 CET | Update | https://www.mdpi.com/1999-4915/2/8/1504 |
| article html file updated | 9 May 2019 05:11 CEST | Update | - |
| article html file updated | 20 March 2019 01:59 CET | Update | - |
| article html file updated | 16 June 2015 10:59 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/1999-4915/2/8/1504/xml |
| article html file updated | 6 February 2013 18:13 CET | Update | - |
| article html file updated | 5 February 2013 22:14 CET | Update | - |
| article html file updated | 28 January 2013 19:46 CET | Update | - |
| article html file updated | 25 January 2013 23:00 CET | Update | - |
| article html file updated | 22 January 2013 02:26 CET | Update | - |
| article html file updated | 18 January 2013 08:28 CET | Original file | - |
