| article html file updated | 16 April 2021 14:58 CEST | Original file | https://www.mdpi.com/2409-9287/6/2/34 |
| article pdf uploaded. | 16 April 2021 14:56 CEST | Version of Record | https://www.mdpi.com/2409-9287/6/2/34/pdf |
| article xml uploaded. | 16 April 2021 14:56 CEST | Update | https://www.mdpi.com/2409-9287/6/2/34/xml |
| article xml file uploaded | 16 April 2021 14:56 CEST | Original file | N/A |
