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| article pdf uploaded. | 6 September 2019 12:49 CEST | Updated version of record | https://www.mdpi.com/2223-7747/8/9/311/pdf |
| article xml uploaded. | 6 September 2019 12:49 CEST | Update | https://www.mdpi.com/2223-7747/8/9/311/xml |
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| article pdf uploaded. | 29 August 2019 15:18 CEST | Version of Record | https://www.mdpi.com/2223-7747/8/9/311/pdf-vor |
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