| article html file updated | 7 February 2020 10:18 CET | Update | https://www.mdpi.com/1996-1073/9/6/461 |
| article html file updated | 5 May 2019 12:41 CEST | Update | - |
| article html file updated | 27 March 2019 07:45 CET | Update | - |
| article html file updated | 28 June 2016 09:35 CEST | Update | - |
| article html file updated | 17 June 2016 10:55 CEST | Original file | - |
| article xml uploaded. | 17 June 2016 10:53 CEST | Update | https://www.mdpi.com/1996-1073/9/6/461/xml |
| article pdf uploaded. | 17 June 2016 10:53 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/461/pdf |
