| article html file updated | 8 February 2020 19:54 CET | Update | https://www.mdpi.com/2313-4321/2/4/20 |
| article html file updated | 28 September 2019 03:06 CEST | Update | - |
| article html file updated | 2 May 2019 17:56 CEST | Update | - |
| article html file updated | 31 October 2017 07:25 CET | Original file | - |
| article xml uploaded. | 31 October 2017 07:24 CET | Original file | https://www.mdpi.com/2313-4321/2/4/20/xml |
| article pdf uploaded. | 31 October 2017 07:24 CET | Version of Record | https://www.mdpi.com/2313-4321/2/4/20/pdf |
