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| article pdf uploaded. | 31 October 2018 07:53 CET | Updated version of record | https://www.mdpi.com/2073-431X/7/4/50/pdf |
| article xml uploaded. | 31 October 2018 07:53 CET | Update | https://www.mdpi.com/2073-431X/7/4/50/xml |
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| article pdf uploaded. | 6 October 2018 10:13 CEST | Version of Record | https://www.mdpi.com/2073-431X/7/4/50/pdf-vor |
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