| article html file updated | 14 February 2020 07:07 CET | Update | https://www.mdpi.com/2227-7072/7/4/68 |
| article html file updated | 31 December 2019 06:11 CET | Update | - |
| article html file updated | 6 November 2019 09:54 CET | Original file | - |
| article pdf uploaded. | 6 November 2019 09:53 CET | Version of Record | https://www.mdpi.com/2227-7072/7/4/68/pdf |
| article xml uploaded. | 6 November 2019 09:53 CET | Update | https://www.mdpi.com/2227-7072/7/4/68/xml |
| article xml file uploaded | 6 November 2019 09:53 CET | Original file | - |
