| article html file updated | 8 February 2020 08:52 CET | Update | https://www.mdpi.com/2413-8851/1/2/21 |
| article html file updated | 25 September 2019 11:29 CEST | Update | - |
| article html file updated | 3 May 2019 16:21 CEST | Update | - |
| article html file updated | 21 June 2017 14:18 CEST | Original file | - |
| article xml uploaded. | 21 June 2017 14:17 CEST | Original file | https://www.mdpi.com/2413-8851/1/2/21/xml |
| article pdf uploaded. | 21 June 2017 14:17 CEST | Version of Record | https://www.mdpi.com/2413-8851/1/2/21/pdf |
