| article html file updated | 8 February 2020 18:21 CET | Update | https://www.mdpi.com/2224-2708/6/4/23 |
| article html file updated | 27 September 2019 17:46 CEST | Update | - |
| article html file updated | 2 May 2019 21:31 CEST | Update | - |
| article html file updated | 2 January 2018 15:38 CET | Update | - |
| article html file updated | 13 October 2017 15:04 CEST | Original file | - |
| article xml uploaded. | 13 October 2017 15:03 CEST | Update | https://www.mdpi.com/2224-2708/6/4/23/xml |
| article xml uploaded. | 13 October 2017 15:03 CEST | Original file | - |
| article pdf uploaded. | 13 October 2017 15:03 CEST | Version of Record | https://www.mdpi.com/2224-2708/6/4/23/pdf |
