| article html file updated | 8 February 2020 18:12 CET | Update | https://www.mdpi.com/2079-9292/6/4/81 |
| article html file updated | 27 September 2019 16:38 CEST | Update | - |
| article html file updated | 2 May 2019 21:53 CEST | Update | - |
| article html file updated | 2 January 2018 11:25 CET | Update | - |
| article html file updated | 12 October 2017 13:38 CEST | Original file | - |
| article xml uploaded. | 12 October 2017 13:37 CEST | Original file | https://www.mdpi.com/2079-9292/6/4/81/xml |
| article pdf uploaded. | 12 October 2017 13:37 CEST | Updated version of record | https://www.mdpi.com/2079-9292/6/4/81/pdf |
| article pdf uploaded. | 11 October 2017 15:55 CEST | Version of Record | https://www.mdpi.com/2079-9292/6/4/81/pdf-vor |
