| article html file updated | 7 February 2020 09:51 CET | Update | https://www.mdpi.com/1996-1073/9/6/439 |
| article html file updated | 5 May 2019 13:33 CEST | Update | - |
| article html file updated | 27 March 2019 06:54 CET | Update | - |
| article html file updated | 28 June 2016 09:31 CEST | Update | - |
| article html file updated | 7 June 2016 11:02 CEST | Original file | - |
| article xml uploaded. | 7 June 2016 11:00 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/439/xml |
| article pdf uploaded. | 7 June 2016 11:00 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/439/pdf |
