| article html file updated | 8 February 2020 00:02 CET | Update | https://www.mdpi.com/2297-8747/22/1/21 |
| article html file updated | 23 September 2019 11:32 CEST | Update | N/A |
| article html file updated | 4 May 2019 09:57 CEST | Update | N/A |
| article html file updated | 23 February 2017 04:56 CET | Original file | N/A |
| article xml uploaded. | 23 February 2017 04:55 CET | Original file | https://www.mdpi.com/2297-8747/22/1/21/xml |
| article pdf uploaded. | 23 February 2017 04:55 CET | Updated version of record | https://www.mdpi.com/2297-8747/22/1/21/pdf |
| article pdf uploaded. | 22 February 2017 14:57 CET | Version of Record | https://www.mdpi.com/2297-8747/22/1/21/pdf-vor |
