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| article pdf uploaded. | 16 June 2019 10:11 CEST | Updated version of record | https://www.mdpi.com/2075-4701/9/6/640/pdf |
| article xml uploaded. | 16 June 2019 10:11 CEST | Update | https://www.mdpi.com/2075-4701/9/6/640/xml |
| article xml file uploaded | 16 June 2019 10:10 CEST | Update | - |
| article pdf uploaded. | 2 June 2019 12:07 CEST | Version of Record | https://www.mdpi.com/2075-4701/9/6/640/pdf-vor |
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