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| article pdf uploaded. | 14 October 2018 08:45 CEST | Updated version of record | https://www.mdpi.com/2218-1989/8/4/62/pdf |
| article xml uploaded. | 14 October 2018 08:45 CEST | Update | https://www.mdpi.com/2218-1989/8/4/62/xml |
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| article pdf uploaded. | 6 October 2018 12:57 CEST | Version of Record | https://www.mdpi.com/2218-1989/8/4/62/pdf-vor |
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