| article html file updated | 7 February 2020 20:45 CET | Update | https://www.mdpi.com/2227-7102/7/1/9 |
| article html file updated | 22 September 2019 17:40 CEST | Update | - |
| article html file updated | 4 May 2019 16:52 CEST | Update | - |
| article html file updated | 27 October 2017 09:54 CEST | Update | - |
| article html file updated | 4 January 2017 09:23 CET | Original file | - |
| article xml uploaded. | 4 January 2017 09:22 CET | Update | https://www.mdpi.com/2227-7102/7/1/9/xml |
| article pdf uploaded. | 4 January 2017 09:22 CET | Version of Record | https://www.mdpi.com/2227-7102/7/1/9/pdf |
