| article html file updated | 14 February 2020 21:17 CET | Update | https://www.mdpi.com/2076-0787/9/1/4 |
| article html file updated | 24 December 2019 05:14 CET | Original file | N/A |
| article pdf uploaded. | 24 December 2019 05:13 CET | Version of Record | https://www.mdpi.com/2076-0787/9/1/4/pdf |
| article xml uploaded. | 24 December 2019 05:13 CET | Update | https://www.mdpi.com/2076-0787/9/1/4/xml |
| article xml file uploaded | 24 December 2019 05:13 CET | Original file | N/A |
