| article html file updated | 8 February 2020 08:43 CET | Update | https://www.mdpi.com/2411-5142/2/2/21 |
| article html file updated | 25 September 2019 10:41 CEST | Update | N/A |
| article html file updated | 3 May 2019 16:38 CEST | Update | N/A |
| article html file updated | 21 June 2017 08:34 CEST | Update | N/A |
| article xml uploaded. | 21 June 2017 08:33 CEST | Update | https://www.mdpi.com/2411-5142/2/2/21/xml |
| article pdf uploaded. | 21 June 2017 08:33 CEST | Updated version of record | https://www.mdpi.com/2411-5142/2/2/21/pdf |
| article html file updated | 19 June 2017 22:23 CEST | Original file | N/A |
| article pdf uploaded. | 19 June 2017 16:05 CEST | Version of Record | https://www.mdpi.com/2411-5142/2/2/21/pdf-vor |
