| article html file updated | 7 February 2020 19:58 CET | Update | https://www.mdpi.com/2077-0375/6/4/59 |
| article html file updated | 22 September 2019 13:25 CEST | Update | - |
| article html file updated | 4 May 2019 18:30 CEST | Update | - |
| article html file updated | 28 December 2016 08:03 CET | Update | - |
| article html file updated | 20 December 2016 10:02 CET | Original file | - |
| article xml uploaded. | 20 December 2016 10:01 CET | Update | https://www.mdpi.com/2077-0375/6/4/59/xml |
| article xml uploaded. | 20 December 2016 10:01 CET | Original file | - |
| article pdf uploaded. | 20 December 2016 10:01 CET | Version of Record | https://www.mdpi.com/2077-0375/6/4/59/pdf |
