| article html file updated | 5 February 2020 22:24 CET | Update | https://new.mdpi.com/2077-0375/2/4/687 |
| article html file updated | 8 May 2019 13:46 CEST | Update | - |
| article html file updated | 20 March 2019 13:36 CET | Update | - |
| article html file updated | 17 June 2015 03:00 CEST | Update | - |
| article html file updated | 18 March 2014 09:50 CET | Update | - |
| article xml file uploaded | 18 March 2014 09:50 CET | Original file | https://new.mdpi.com/2077-0375/2/4/687/xml |
| article html file updated | 7 February 2013 15:48 CET | Update | - |
| article html file updated | 24 January 2013 05:14 CET | Original file | - |
