| article html file updated | 7 February 2020 06:36 CET | Update | https://www.mdpi.com/2297-8747/21/2/9 |
| article html file updated | 5 May 2019 20:01 CEST | Update | - |
| article html file updated | 27 March 2019 00:40 CET | Update | - |
| article html file updated | 30 March 2016 14:19 CEST | Original file | - |
| article xml uploaded. | 30 March 2016 14:18 CEST | Original file | https://www.mdpi.com/2297-8747/21/2/9/xml |
| article pdf uploaded. | 30 March 2016 14:17 CEST | Version of Record | https://www.mdpi.com/2297-8747/21/2/9/pdf |
