| article html file updated | 8 February 2020 19:07 CET | Update | https://www.mdpi.com/2227-7080/5/4/68 |
| article html file updated | 27 September 2019 22:20 CEST | Update | N/A |
| article html file updated | 2 May 2019 19:45 CEST | Update | N/A |
| article html file updated | 2 January 2018 11:12 CET | Update | N/A |
| article html file updated | 21 October 2017 12:23 CEST | Original file | N/A |
| article xml uploaded. | 21 October 2017 12:21 CEST | Update | https://www.mdpi.com/2227-7080/5/4/68/xml |
| article xml uploaded. | 21 October 2017 12:21 CEST | Original file | N/A |
| article pdf uploaded. | 21 October 2017 12:21 CEST | Version of Record | https://www.mdpi.com/2227-7080/5/4/68/pdf |
