| article html file updated | 8 February 2020 08:31 CET | Update | https://www.mdpi.com/2224-2708/6/2/9 |
| article html file updated | 25 September 2019 09:38 CEST | Update | - |
| article html file updated | 3 May 2019 17:02 CEST | Update | - |
| article html file updated | 29 June 2017 11:34 CEST | Update | - |
| article html file updated | 20 June 2017 12:50 CEST | Update | - |
| article xml uploaded. | 20 June 2017 12:48 CEST | Update | https://www.mdpi.com/2224-2708/6/2/9/xml |
| article pdf uploaded. | 20 June 2017 12:48 CEST | Updated version of record | https://www.mdpi.com/2224-2708/6/2/9/pdf |
| article html file updated | 16 June 2017 13:31 CEST | Original file | - |
| article pdf uploaded. | 16 June 2017 13:29 CEST | Version of Record | https://www.mdpi.com/2224-2708/6/2/9/pdf-vor |
