| article html file updated | 31 December 2020 14:52 CET | Original file | https://www.mdpi.com/1999-4923/13/1/50 |
| article pdf uploaded. | 31 December 2020 14:51 CET | Version of Record | https://www.mdpi.com/1999-4923/13/1/50/pdf |
| article xml uploaded. | 31 December 2020 14:51 CET | Update | https://www.mdpi.com/1999-4923/13/1/50/xml |
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