| article html file updated | 7 February 2020 02:49 CET | Update | https://www.mdpi.com/2079-4991/6/1/4 |
| article html file updated | 6 May 2019 03:43 CEST | Update | - |
| article html file updated | 26 March 2019 17:25 CET | Update | - |
| article html file updated | 24 February 2017 10:11 CET | Original file | - |
| article pdf uploaded. | 29 December 2015 13:44 CET | Version of Record | https://www.mdpi.com/2079-4991/6/1/4/pdf |
| article xml uploaded. | 29 December 2015 13:44 CET | Original file | https://www.mdpi.com/2079-4991/6/1/4/xml |
