| article html file updated | 8 February 2020 19:44 CET | Update | https://www.mdpi.com/2226-4310/4/4/50 |
| article html file updated | 28 September 2019 02:06 CEST | Update | - |
| article html file updated | 2 May 2019 18:19 CEST | Update | - |
| article html file updated | 2 January 2018 16:32 CET | Update | - |
| article html file updated | 28 October 2017 11:43 CEST | Original file | - |
| article xml uploaded. | 28 October 2017 11:41 CEST | Original file | https://www.mdpi.com/2226-4310/4/4/50/xml |
| article pdf uploaded. | 28 October 2017 11:41 CEST | Version of Record | https://www.mdpi.com/2226-4310/4/4/50/pdf |
