| article html file updated | 7 February 2020 16:44 CET | Update | https://www.mdpi.com/2078-1547/7/2/18 |
| article html file updated | 5 May 2019 00:55 CEST | Update | N/A |
| article html file updated | 21 October 2016 03:49 CEST | Original file | N/A |
| article xml uploaded. | 21 October 2016 03:48 CEST | Original file | https://www.mdpi.com/2078-1547/7/2/18/xml |
| article pdf uploaded. | 21 October 2016 03:48 CEST | Version of Record | https://www.mdpi.com/2078-1547/7/2/18/pdf |
