| article xml uploaded. | 17 May 2021 08:00 CEST | Update | https://www.mdpi.com/2409-515X/4/1/8/xml |
| article html file updated | 17 May 2021 08:00 CEST | Update | https://www.mdpi.com/2409-515X/4/1/8 |
| article html file updated | 10 February 2018 13:04 CET | Original file | N/A |
| article xml uploaded. | 10 February 2018 13:03 CET | Original file | N/A |
| article pdf uploaded. | 10 February 2018 13:03 CET | Version of Record | https://www.mdpi.com/2409-515X/4/1/8/pdf |
