| article html file updated | 7 February 2020 16:02 CET | Update | https://www.mdpi.com/2077-0472/6/4/50 |
| article html file updated | 5 May 2019 02:13 CEST | Update | - |
| article html file updated | 28 December 2016 05:09 CET | Update | - |
| article html file updated | 8 October 2016 12:00 CEST | Original file | - |
| article xml uploaded. | 8 October 2016 11:59 CEST | Original file | https://www.mdpi.com/2077-0472/6/4/50/xml |
| article pdf uploaded. | 8 October 2016 11:59 CEST | Version of Record | https://www.mdpi.com/2077-0472/6/4/50/pdf |
