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| article pdf uploaded. | 23 March 2020 10:50 CET | Updated version of record | https://www.mdpi.com/1422-0067/21/6/2108/pdf |
| article xml uploaded. | 23 March 2020 10:50 CET | Update | https://www.mdpi.com/1422-0067/21/6/2108/xml |
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| article pdf uploaded. | 19 March 2020 11:23 CET | Version of Record | https://www.mdpi.com/1422-0067/21/6/2108/pdf-vor |
| article xml file uploaded | 19 March 2020 11:23 CET | Original file | - |