| article html file updated | 8 February 2020 08:20 CET | Update | https://www.mdpi.com/2073-4360/9/6/220 |
| article html file updated | 25 September 2019 08:40 CEST | Update | - |
| article html file updated | 3 May 2019 17:23 CEST | Update | - |
| article html file updated | 18 March 2019 05:58 CET | Update | - |
| article html file updated | 28 June 2017 14:22 CEST | Update | - |
| article html file updated | 15 June 2017 08:19 CEST | Original file | - |
| article xml uploaded. | 15 June 2017 08:17 CEST | Original file | https://www.mdpi.com/2073-4360/9/6/220/xml |
| article pdf uploaded. | 15 June 2017 08:17 CEST | Version of Record | https://www.mdpi.com/2073-4360/9/6/220/pdf |
