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| article pdf uploaded. | 22 October 2019 08:43 CEST | Updated version of record | https://www.mdpi.com/2226-4787/7/4/142/pdf |
| article xml uploaded. | 22 October 2019 08:43 CEST | Update | https://www.mdpi.com/2226-4787/7/4/142/xml |
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| article pdf uploaded. | 18 October 2019 08:35 CEST | Updated version of record | https://www.mdpi.com/2226-4787/7/4/142/pdf-vor |
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| article pdf uploaded. | 11 October 2019 12:25 CEST | Version of Record | https://www.mdpi.com/2226-4787/7/4/142/pdf-vor |
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