| article html file updated | 19 June 2021 15:05 CEST | Original file | https://www.mdpi.com/2227-7102/11/6/304 |
| article pdf uploaded. | 19 June 2021 15:03 CEST | Version of Record | https://www.mdpi.com/2227-7102/11/6/304/pdf |
| article xml uploaded. | 19 June 2021 15:03 CEST | Update | https://www.mdpi.com/2227-7102/11/6/304/xml |
| article xml file uploaded | 19 June 2021 15:03 CEST | Original file | N/A |
