| article html file updated | 7 February 2020 20:40 CET | Update | https://www.mdpi.com/2073-8994/9/1/6 |
| article html file updated | 22 September 2019 17:14 CEST | Update | - |
| article html file updated | 4 May 2019 17:03 CEST | Update | - |
| article html file updated | 7 February 2017 04:18 CET | Update | - |
| article html file updated | 6 January 2017 13:01 CET | Original file | - |
| article xml uploaded. | 6 January 2017 13:00 CET | Original file | https://www.mdpi.com/2073-8994/9/1/6/xml |
| article pdf uploaded. | 6 January 2017 13:00 CET | Updated version of record | https://www.mdpi.com/2073-8994/9/1/6/pdf |
| article pdf uploaded. | 1 January 2017 10:00 CET | Version of Record | https://www.mdpi.com/2073-8994/9/1/6/pdf-vor |
