| article html file updated | 9 February 2020 12:20 CET | Update | https://www.mdpi.com/2227-7099/6/2/23 |
| article html file updated | 2 October 2019 05:45 CEST | Update | - |
| article html file updated | 1 May 2019 06:30 CEST | Update | - |
| article html file updated | 17 April 2019 06:34 CEST | Update | - |
| article html file updated | 29 March 2019 12:16 CET | Update | - |
| article html file updated | 28 June 2018 08:45 CEST | Update | - |
| article html file updated | 3 April 2018 13:51 CEST | Original file | - |
| article xml uploaded. | 3 April 2018 08:09 CEST | Original file | https://www.mdpi.com/2227-7099/6/2/23/xml |
| article pdf uploaded. | 3 April 2018 08:09 CEST | Version of Record | https://www.mdpi.com/2227-7099/6/2/23/pdf |
