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| article pdf uploaded. | 22 October 2019 10:28 CEST | Updated version of record | https://www.mdpi.com/2227-9059/7/4/74/pdf |
| article xml uploaded. | 22 October 2019 10:28 CEST | Update | https://www.mdpi.com/2227-9059/7/4/74/xml |
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| article pdf uploaded. | 24 September 2019 13:17 CEST | Version of Record | https://www.mdpi.com/2227-9059/7/4/74/pdf-vor |
| article xml uploaded. | 24 September 2019 13:17 CEST | Update | - |
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