| article html file updated | 7 February 2020 18:20 CET | Update | https://www.mdpi.com/2077-0375/6/4/48 |
| article html file updated | 22 September 2019 06:16 CEST | Update | - |
| article html file updated | 4 May 2019 21:53 CEST | Update | - |
| article html file updated | 28 December 2016 07:58 CET | Update | - |
| article html file updated | 21 November 2016 10:23 CET | Original file | - |
| article xml uploaded. | 21 November 2016 10:21 CET | Update | https://www.mdpi.com/2077-0375/6/4/48/xml |
| article xml uploaded. | 21 November 2016 10:21 CET | Original file | - |
| article pdf uploaded. | 21 November 2016 10:21 CET | Version of Record | https://www.mdpi.com/2077-0375/6/4/48/pdf |
