| article html file updated | 7 February 2020 20:38 CET | Update | https://www.mdpi.com/2071-1050/9/1/57 |
| article html file updated | 22 September 2019 17:05 CEST | Update | - |
| article html file updated | 4 May 2019 17:08 CEST | Update | - |
| article html file updated | 7 February 2017 09:54 CET | Update | - |
| article html file updated | 1 January 2017 04:54 CET | Original file | - |
| article xml uploaded. | 1 January 2017 04:53 CET | Original file | https://www.mdpi.com/2071-1050/9/1/57/xml |
| article pdf uploaded. | 1 January 2017 04:53 CET | Version of Record | https://www.mdpi.com/2071-1050/9/1/57/pdf |
