| article html file updated | 8 February 2020 23:28 CET | Update | https://www.mdpi.com/2075-1702/5/4/31 |
| article html file updated | 29 September 2019 01:41 CEST | Update | - |
| article html file updated | 2 May 2019 09:56 CEST | Update | - |
| article html file updated | 18 April 2019 07:35 CEST | Update | - |
| article html file updated | 2 January 2018 14:03 CET | Update | - |
| article html file updated | 7 December 2017 14:58 CET | Original file | - |
| article xml uploaded. | 7 December 2017 14:57 CET | Original file | https://www.mdpi.com/2075-1702/5/4/31/xml |
| article pdf uploaded. | 7 December 2017 14:57 CET | Version of Record | https://www.mdpi.com/2075-1702/5/4/31/pdf |
