| article html file updated | 7 February 2020 05:16 CET | Update | https://www.mdpi.com/2077-0375/6/1/18 |
| article html file updated | 5 May 2019 22:48 CEST | Update | - |
| article html file updated | 26 March 2019 22:12 CET | Update | - |
| article html file updated | 30 March 2016 08:00 CEST | Original file | - |
| article pdf uploaded. | 1 March 2016 10:22 CET | Version of Record | https://www.mdpi.com/2077-0375/6/1/18/pdf |
| article xml uploaded. | 1 March 2016 10:22 CET | Original file | https://www.mdpi.com/2077-0375/6/1/18/xml |
