| article html file updated | 7 February 2020 21:50 CET | Update | https://www.mdpi.com/2308-3417/2/1/8 |
| article html file updated | 22 September 2019 23:27 CEST | Update | - |
| article html file updated | 4 May 2019 14:22 CEST | Update | - |
| article html file updated | 20 January 2017 14:06 CET | Original file | - |
| article xml uploaded. | 20 January 2017 14:05 CET | Original file | https://www.mdpi.com/2308-3417/2/1/8/xml |
| article pdf uploaded. | 20 January 2017 14:05 CET | Version of Record | https://www.mdpi.com/2308-3417/2/1/8/pdf |
