| article html file updated | 7 February 2020 22:57 CET | Update | https://www.mdpi.com/2227-7080/5/1/7 |
| article html file updated | 23 September 2019 05:33 CEST | Update | - |
| article html file updated | 4 May 2019 12:07 CEST | Update | - |
| article html file updated | 30 March 2017 09:00 CEST | Update | - |
| article html file updated | 9 February 2017 09:40 CET | Original file | - |
| article xml uploaded. | 9 February 2017 09:39 CET | Original file | https://www.mdpi.com/2227-7080/5/1/7/xml |
| article pdf uploaded. | 9 February 2017 09:39 CET | Version of Record | https://www.mdpi.com/2227-7080/5/1/7/pdf |
