| article html file updated | 7 February 2020 21:41 CET | Update | https://www.mdpi.com/2071-1050/9/1/138 |
| article html file updated | 22 September 2019 22:34 CEST | Update | - |
| article html file updated | 4 May 2019 14:44 CEST | Update | - |
| article html file updated | 7 February 2017 10:20 CET | Update | - |
| article html file updated | 18 January 2017 08:39 CET | Original file | - |
| article xml uploaded. | 18 January 2017 08:38 CET | Original file | https://www.mdpi.com/2071-1050/9/1/138/xml |
| article pdf uploaded. | 18 January 2017 08:38 CET | Version of Record | https://www.mdpi.com/2071-1050/9/1/138/pdf |
