| article html file updated | 7 February 2020 16:58 CET | Update | https://www.mdpi.com/2411-5134/1/4/21 |
| article html file updated | 5 May 2019 00:29 CEST | Update | - |
| article html file updated | 26 October 2016 05:44 CEST | Original file | - |
| article xml uploaded. | 26 October 2016 05:43 CEST | Update | https://www.mdpi.com/2411-5134/1/4/21/xml |
| article xml uploaded. | 26 October 2016 05:42 CEST | Original file | - |
| article pdf uploaded. | 26 October 2016 05:42 CEST | Version of Record | https://www.mdpi.com/2411-5134/1/4/21/pdf |
