| article html file updated | 8 February 2020 18:51 CET | Update | https://www.mdpi.com/2227-7080/5/4/67 |
| article html file updated | 2 May 2019 20:22 CEST | Update | - |
| article html file updated | 2 January 2018 11:12 CET | Update | - |
| article html file updated | 20 October 2017 05:11 CEST | Original file | - |
| article xml uploaded. | 20 October 2017 05:09 CEST | Update | https://www.mdpi.com/2227-7080/5/4/67/xml |
| article xml uploaded. | 20 October 2017 05:09 CEST | Update | - |
| article xml uploaded. | 20 October 2017 05:09 CEST | Original file | - |
| article pdf uploaded. | 20 October 2017 05:09 CEST | Updated version of record | https://www.mdpi.com/2227-7080/5/4/67/pdf |
| article pdf uploaded. | 18 October 2017 16:36 CEST | Version of Record | https://www.mdpi.com/2227-7080/5/4/67/pdf-vor |
