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| article pdf uploaded. | 24 October 2019 09:29 CEST | Updated version of record | https://www.mdpi.com/2079-6382/8/4/172/pdf |
| article xml uploaded. | 24 October 2019 09:29 CEST | Update | https://www.mdpi.com/2079-6382/8/4/172/xml |
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| article pdf uploaded. | 1 October 2019 10:41 CEST | Version of Record | https://www.mdpi.com/2079-6382/8/4/172/pdf-vor |
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