| article html file updated | 8 February 2020 20:45 CET | Update | https://www.mdpi.com/2076-0787/6/4/86 |
| article html file updated | 2 May 2019 15:58 CEST | Update | N/A |
| article html file updated | 9 November 2017 11:38 CET | Original file | N/A |
| article xml uploaded. | 9 November 2017 11:36 CET | Original file | https://www.mdpi.com/2076-0787/6/4/86/xml |
| article pdf uploaded. | 9 November 2017 11:36 CET | Version of Record | https://www.mdpi.com/2076-0787/6/4/86/pdf |
