| article html file updated | 5 February 2020 19:36 CET | Update | https://www.mdpi.com/2076-328X/2/1/23 |
| article html file updated | 8 May 2019 19:58 CEST | Update | - |
| article html file updated | 25 March 2019 09:40 CET | Update | - |
| article html file updated | 16 June 2015 22:04 CEST | Update | - |
| article html file updated | 26 August 2014 03:57 CEST | Update | - |
| article xml file uploaded | 26 August 2014 03:57 CEST | Original file | https://www.mdpi.com/2076-328X/2/1/23/xml |
| article html file updated | 7 February 2013 10:51 CET | Update | - |
| article html file updated | 7 February 2013 00:57 CET | Update | - |
| article html file updated | 6 February 2013 06:20 CET | Update | - |
| article html file updated | 29 January 2013 01:59 CET | Update | - |
| article html file updated | 26 January 2013 08:31 CET | Update | - |
| article html file updated | 23 January 2013 11:25 CET | Original file | - |
