| article html file updated | 7 February 2020 22:48 CET | Update | https://www.mdpi.com/2410-3896/2/1/9 |
| article html file updated | 23 September 2019 04:38 CEST | Update | - |
| article html file updated | 4 May 2019 12:27 CEST | Update | - |
| article html file updated | 27 October 2017 09:00 CEST | Update | - |
| article html file updated | 8 February 2017 02:12 CET | Original file | - |
| article pdf uploaded. | 7 February 2017 11:18 CET | Version of Record | https://www.mdpi.com/2410-3896/2/1/9/pdf |
