| article html file updated | 8 February 2020 20:30 CET | Update | https://www.mdpi.com/2073-4409/6/4/42 |
| article html file updated | 28 September 2019 06:57 CEST | Update | - |
| article html file updated | 2 May 2019 16:34 CEST | Update | - |
| article html file updated | 2 January 2018 09:35 CET | Update | - |
| article html file updated | 7 November 2017 09:30 CET | Original file | - |
| article xml uploaded. | 7 November 2017 09:29 CET | Update | https://www.mdpi.com/2073-4409/6/4/42/xml |
| article xml uploaded. | 7 November 2017 09:29 CET | Original file | - |
| article pdf uploaded. | 7 November 2017 09:29 CET | Version of Record | https://www.mdpi.com/2073-4409/6/4/42/pdf |
