| article html file updated | 7 February 2020 21:58 CET | Update | https://www.mdpi.com/2227-7080/5/1/6 |
| article html file updated | 23 September 2019 00:08 CEST | Update | - |
| article html file updated | 4 May 2019 14:06 CEST | Update | - |
| article html file updated | 30 March 2017 09:00 CEST | Update | - |
| article html file updated | 22 January 2017 09:01 CET | Original file | - |
| article xml uploaded. | 22 January 2017 09:00 CET | Update | https://www.mdpi.com/2227-7080/5/1/6/xml |
| article xml uploaded. | 22 January 2017 09:00 CET | Original file | - |
| article pdf uploaded. | 22 January 2017 09:00 CET | Version of Record | https://www.mdpi.com/2227-7080/5/1/6/pdf |
