| article html file updated | 1 July 2020 09:14 CEST | Original file | https://www.mdpi.com/2411-9660/4/3/18 |
| article pdf uploaded. | 1 July 2020 09:13 CEST | Version of Record | https://www.mdpi.com/2411-9660/4/3/18/pdf |
| article xml uploaded. | 1 July 2020 09:13 CEST | Update | https://www.mdpi.com/2411-9660/4/3/18/xml |
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