| article html file updated | 7 February 2020 03:34 CET | Update | https://www.mdpi.com/2073-4360/8/1/21 |
| article html file updated | 21 September 2019 09:54 CEST | Update | - |
| article html file updated | 6 May 2019 02:19 CEST | Update | - |
| article html file updated | 26 March 2019 18:45 CET | Update | - |
| article html file updated | 15 March 2019 08:12 CET | Original file | - |
| article pdf uploaded. | 19 January 2016 09:00 CET | Version of Record | https://www.mdpi.com/2073-4360/8/1/21/pdf |
| article xml uploaded. | 19 January 2016 09:00 CET | Original file | https://www.mdpi.com/2073-4360/8/1/21/xml |
