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| article pdf uploaded. | 26 April 2019 10:15 CEST | Updated version of record | https://www.mdpi.com/2218-273X/9/4/142/pdf |
| article xml uploaded. | 26 April 2019 10:15 CEST | Update | https://www.mdpi.com/2218-273X/9/4/142/xml |
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| article pdf uploaded. | 9 April 2019 13:44 CEST | Version of Record | https://www.mdpi.com/2218-273X/9/4/142/pdf-vor |
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