| article html file updated | 7 February 2020 20:41 CET | Update | https://www.mdpi.com/2409-9287/2/1/2 |
| article html file updated | 4 May 2019 17:00 CEST | Update | N/A |
| article html file updated | 3 January 2017 12:26 CET | Original file | N/A |
| article xml uploaded. | 3 January 2017 12:25 CET | Original file | https://www.mdpi.com/2409-9287/2/1/2/xml |
| article pdf uploaded. | 3 January 2017 12:25 CET | Version of Record | https://www.mdpi.com/2409-9287/2/1/2/pdf |
