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| article pdf uploaded. | 25 April 2019 09:06 CEST | Updated version of record | https://www.mdpi.com/2223-7747/8/4/104/pdf |
| article xml uploaded. | 25 April 2019 09:06 CEST | Update | https://www.mdpi.com/2223-7747/8/4/104/xml |
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| article pdf uploaded. | 18 April 2019 12:57 CEST | Version of Record | https://www.mdpi.com/2223-7747/8/4/104/pdf-vor |
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