| article html file updated | 8 February 2020 08:53 CET | Update | https://www.mdpi.com/2072-6694/9/6/69 |
| article html file updated | 25 September 2019 11:33 CEST | Update | - |
| article html file updated | 3 May 2019 16:19 CEST | Update | - |
| article html file updated | 27 June 2017 09:56 CEST | Update | - |
| article html file updated | 21 June 2017 13:32 CEST | Original file | - |
| article xml uploaded. | 21 June 2017 13:31 CEST | Original file | https://www.mdpi.com/2072-6694/9/6/69/xml |
| article pdf uploaded. | 21 June 2017 13:31 CEST | Version of Record | https://www.mdpi.com/2072-6694/9/6/69/pdf |
