| article html file updated | 8 February 2020 06:59 CET | Update | https://www.mdpi.com/2072-6694/9/6/61 |
| article html file updated | 25 September 2019 01:47 CEST | Update | - |
| article html file updated | 3 May 2019 19:54 CEST | Update | - |
| article html file updated | 27 June 2017 09:57 CEST | Update | - |
| article html file updated | 1 June 2017 05:24 CEST | Original file | - |
| article xml uploaded. | 1 June 2017 05:23 CEST | Original file | https://www.mdpi.com/2072-6694/9/6/61/xml |
| article pdf uploaded. | 1 June 2017 05:23 CEST | Updated version of record | https://www.mdpi.com/2072-6694/9/6/61/pdf |
| article pdf uploaded. | 30 May 2017 09:30 CEST | Version of Record | https://www.mdpi.com/2072-6694/9/6/61/pdf-vor |
