| article html file updated | 7 February 2020 08:07 CET | Update | https://www.mdpi.com/2411-5134/1/2/9 |
| article html file updated | 5 May 2019 16:54 CEST | Update | - |
| article html file updated | 27 March 2019 03:37 CET | Update | - |
| article html file updated | 3 May 2016 13:17 CEST | Original file | - |
| article xml uploaded. | 3 May 2016 13:15 CEST | Original file | https://www.mdpi.com/2411-5134/1/2/9/xml |
| article pdf uploaded. | 3 May 2016 13:15 CEST | Version of Record | https://www.mdpi.com/2411-5134/1/2/9/pdf |
