| article html file updated | 7 February 2020 05:00 CET | Update | https://www.mdpi.com/2077-1312/4/1/15 |
| article html file updated | 5 May 2019 23:18 CEST | Update | - |
| article html file updated | 26 March 2019 21:41 CET | Update | - |
| article html file updated | 27 October 2017 11:14 CEST | Original file | - |
| article pdf uploaded. | 25 February 2016 14:28 CET | Version of Record | https://www.mdpi.com/2077-1312/4/1/15/pdf |
| article xml uploaded. | 25 February 2016 14:28 CET | Original file | https://www.mdpi.com/2077-1312/4/1/15/xml |
