| article html file updated | 7 February 2020 06:00 CET | Update | https://www.mdpi.com/2077-1312/4/1/27 |
| article html file updated | 5 May 2019 21:14 CEST | Update | - |
| article html file updated | 26 March 2019 23:39 CET | Update | - |
| article html file updated | 27 October 2017 11:17 CEST | Original file | - |
| article xml uploaded. | 17 March 2016 09:11 CET | Original file | https://www.mdpi.com/2077-1312/4/1/27/xml |
| article pdf uploaded. | 17 March 2016 09:11 CET | Version of Record | https://www.mdpi.com/2077-1312/4/1/27/pdf |
