| article html file updated | 7 February 2020 09:20 CET | Update | https://www.mdpi.com/1996-1944/9/6/404 |
| article html file updated | 5 May 2019 14:34 CEST | Update | - |
| article html file updated | 27 March 2019 05:52 CET | Update | - |
| article html file updated | 28 June 2016 12:02 CEST | Update | - |
| article html file updated | 26 May 2016 13:15 CEST | Original file | - |
| article xml uploaded. | 26 May 2016 11:45 CEST | Update | https://www.mdpi.com/1996-1944/9/6/404/xml |
| article pdf uploaded. | 26 May 2016 11:45 CEST | Version of Record | https://www.mdpi.com/1996-1944/9/6/404/pdf |
