| article html file updated | 7 February 2020 09:12 CET | Update | https://www.mdpi.com/2297-8747/21/2/20 |
| article html file updated | 5 May 2019 14:49 CEST | Update | N/A |
| article html file updated | 27 March 2019 05:37 CET | Update | N/A |
| article html file updated | 24 May 2016 16:12 CEST | Original file | N/A |
| article xml uploaded. | 24 May 2016 16:11 CEST | Original file | https://www.mdpi.com/2297-8747/21/2/20/xml |
| article pdf uploaded. | 24 May 2016 16:11 CEST | Version of Record | https://www.mdpi.com/2297-8747/21/2/20/pdf |
