| article html file updated | 8 February 2020 17:59 CET | Update | https://www.mdpi.com/2226-4787/5/4/54 |
| article html file updated | 27 September 2019 14:50 CEST | Update | - |
| article html file updated | 2 May 2019 22:20 CEST | Update | - |
| article html file updated | 2 January 2018 14:24 CET | Update | - |
| article html file updated | 16 October 2017 03:24 CEST | Original file | - |
| article xml uploaded. | 16 October 2017 03:23 CEST | Original file | https://www.mdpi.com/2226-4787/5/4/54/xml |
| article pdf uploaded. | 16 October 2017 03:23 CEST | Updated version of record | https://www.mdpi.com/2226-4787/5/4/54/pdf |
| article pdf uploaded. | 9 October 2017 14:14 CEST | Version of Record | https://www.mdpi.com/2226-4787/5/4/54/pdf-vor |
