| article pdf uploaded. | 14 January 2020 03:02 CET | Updated version of record | https://www.mdpi.com/2504-3900/18/1/4/pdf |
| article pdf uploaded. | 8 July 2019 05:09 CEST | Updated version of record | https://www.mdpi.com/2504-3900/18/1/4/pdf-vor |
| article pdf uploaded. | 8 July 2019 04:40 CEST | Version of Record | https://www.mdpi.com/2504-3900/18/1/4/pdf-vor |
| article xml file uploaded | 8 July 2019 04:40 CEST | Original file | - |
