| article html file updated | 7 February 2020 16:40 CET | Update | https://www.mdpi.com/2079-9268/6/4/20 |
| article html file updated | 5 May 2019 01:03 CEST | Update | N/A |
| article html file updated | 20 October 2016 08:52 CEST | Original file | N/A |
| article xml uploaded. | 20 October 2016 08:51 CEST | Original file | https://www.mdpi.com/2079-9268/6/4/20/xml |
| article pdf uploaded. | 20 October 2016 08:51 CEST | Version of Record | https://www.mdpi.com/2079-9268/6/4/20/pdf |
