| article html file updated | 7 February 2020 06:51 CET | Update | https://www.mdpi.com/1996-1073/9/4/268 |
| article html file updated | 5 May 2019 19:33 CEST | Update | - |
| article html file updated | 27 March 2019 01:04 CET | Update | - |
| article html file updated | 28 April 2016 07:54 CEST | Update | - |
| article html file updated | 6 April 2016 08:45 CEST | Original file | - |
| article xml uploaded. | 6 April 2016 08:44 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/268/xml |
| article pdf uploaded. | 6 April 2016 08:44 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/268/pdf |
