| article html file updated | 4 March 2020 12:44 CET | Original file | https://www.mdpi.com/2305-7084/4/1/15 |
| article pdf uploaded. | 4 March 2020 12:43 CET | Version of Record | https://www.mdpi.com/2305-7084/4/1/15/pdf |
| article xml uploaded. | 4 March 2020 12:43 CET | Update | https://www.mdpi.com/2305-7084/4/1/15/xml |
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