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| article pdf uploaded. | 24 December 2019 09:21 CET | Updated version of record | https://www.mdpi.com/1660-3397/18/1/6/pdf |
| article xml uploaded. | 24 December 2019 09:21 CET | Update | https://www.mdpi.com/1660-3397/18/1/6/xml |
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| article html file updated | 19 December 2019 11:16 CET | Original file | - |
| article pdf uploaded. | 19 December 2019 11:15 CET | Version of Record | https://www.mdpi.com/1660-3397/18/1/6/pdf-vor |
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