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| article pdf uploaded. | 23 April 2019 12:37 CEST | Updated version of record | https://www.mdpi.com/2226-4310/6/4/42/pdf |
| article xml uploaded. | 23 April 2019 12:37 CEST | Update | https://www.mdpi.com/2226-4310/6/4/42/xml |
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| article pdf uploaded. | 8 April 2019 17:38 CEST | Version of Record | https://www.mdpi.com/2226-4310/6/4/42/pdf-vor |
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