| article html file updated | 7 February 2020 17:38 CET | Update | https://www.mdpi.com/2078-1547/7/2/20 |
| article html file updated | 4 May 2019 23:14 CEST | Update | N/A |
| article html file updated | 8 November 2016 04:00 CET | Original file | N/A |
| article xml uploaded. | 8 November 2016 03:58 CET | Original file | https://www.mdpi.com/2078-1547/7/2/20/xml |
| article pdf uploaded. | 8 November 2016 03:58 CET | Version of Record | https://www.mdpi.com/2078-1547/7/2/20/pdf |
