| article html file updated | 7 February 2020 17:16 CET | Update | https://www.mdpi.com/2297-8747/21/4/43 |
| article html file updated | 4 May 2019 23:55 CEST | Update | - |
| article html file updated | 24 November 2016 04:24 CET | Update | - |
| article html file updated | 10 November 2016 06:41 CET | Original file | - |
| article pdf uploaded. | 31 October 2016 10:59 CET | Version of Record | https://www.mdpi.com/2297-8747/21/4/43/pdf |
