| article html file updated | 9 February 2020 09:17 CET | Update | https://www.mdpi.com/2227-7080/6/1/31 |
| article html file updated | 1 October 2019 10:40 CEST | Update | - |
| article html file updated | 1 May 2019 12:55 CEST | Update | - |
| article html file updated | 17 April 2019 12:36 CEST | Update | - |
| article html file updated | 29 March 2019 05:21 CET | Update | - |
| article html file updated | 28 March 2018 04:23 CEST | Update | - |
| article html file updated | 27 March 2018 16:54 CEST | Update | - |
| article html file updated | 9 March 2018 17:09 CET | Original file | - |
| article xml uploaded. | 9 March 2018 17:08 CET | Update | https://www.mdpi.com/2227-7080/6/1/31/xml |
| article pdf uploaded. | 9 March 2018 17:08 CET | Version of Record | https://www.mdpi.com/2227-7080/6/1/31/pdf |
