| article html file updated | 7 February 2020 16:38 CET | Update | https://www.mdpi.com/2297-8747/21/4/42 |
| article html file updated | 5 May 2019 01:08 CEST | Update | N/A |
| article html file updated | 19 October 2016 12:10 CEST | Original file | N/A |
| article xml uploaded. | 19 October 2016 12:08 CEST | Update | https://www.mdpi.com/2297-8747/21/4/42/xml |
| article xml uploaded. | 19 October 2016 12:08 CEST | Update | N/A |
| article xml uploaded. | 19 October 2016 12:08 CEST | Original file | N/A |
| article pdf uploaded. | 19 October 2016 12:08 CEST | Version of Record | https://www.mdpi.com/2297-8747/21/4/42/pdf |
