| article html file updated | 7 February 2020 21:18 CET | Update | https://www.mdpi.com/2304-6767/5/1/6 |
| article html file updated | 4 May 2019 15:41 CEST | Update | - |
| article html file updated | 12 January 2017 08:46 CET | Original file | - |
| article xml uploaded. | 12 January 2017 08:45 CET | Original file | https://www.mdpi.com/2304-6767/5/1/6/xml |
| article pdf uploaded. | 12 January 2017 08:45 CET | Version of Record | https://www.mdpi.com/2304-6767/5/1/6/pdf |
