| article html file updated | 7 February 2020 05:29 CET | Update | https://www.mdpi.com/2297-8747/21/1/2 |
| article html file updated | 5 May 2019 22:22 CEST | Update | N/A |
| article html file updated | 26 March 2019 22:38 CET | Original file | N/A |
| article pdf uploaded. | 4 March 2016 12:31 CET | Version of Record | https://www.mdpi.com/2297-8747/21/1/2/pdf |
| article xml uploaded. | 4 March 2016 12:31 CET | Original file | https://www.mdpi.com/2297-8747/21/1/2/xml |
