| article pdf uploaded. | 9 December 2019 11:22 CET | Updated version of record | https://www.mdpi.com/2504-3900/9/1/12/pdf |
| article pdf uploaded. | 18 March 2019 06:22 CET | Version of Record | https://www.mdpi.com/2504-3900/9/1/12/pdf-vor |
| article xml file uploaded | 18 March 2019 06:22 CET | Original file | N/A |
