| article html file updated | 8 February 2020 20:33 CET | Update | https://www.mdpi.com/2076-0760/6/4/137 |
| article html file updated | 2 May 2019 16:28 CEST | Update | N/A |
| article html file updated | 8 November 2017 11:24 CET | Original file | N/A |
| article xml uploaded. | 8 November 2017 11:10 CET | Original file | https://www.mdpi.com/2076-0760/6/4/137/xml |
| article pdf uploaded. | 8 November 2017 11:10 CET | Updated version of record | https://www.mdpi.com/2076-0760/6/4/137/pdf |
| article pdf uploaded. | 7 November 2017 14:41 CET | Version of Record | https://www.mdpi.com/2076-0760/6/4/137/pdf-vor |
