| article html file updated | 20 May 2020 14:45 CEST | Update | https://www.mdpi.com/2308-3425/4/2/6 |
| article xml uploaded. | 20 May 2020 14:44 CEST | Update | https://www.mdpi.com/2308-3425/4/2/6/xml |
| article html file updated | 23 May 2017 03:38 CEST | Original file | - |
| article pdf uploaded. | 4 May 2017 12:05 CEST | Version of Record | https://www.mdpi.com/2308-3425/4/2/6/pdf |
