| article html file updated | 6 February 2020 23:56 CET | Update | https://www.mdpi.com/2076-0787/4/4/661 |
| article html file updated | 21 September 2019 05:00 CEST | Update | N/A |
| article html file updated | 6 May 2019 09:00 CEST | Update | N/A |
| article html file updated | 26 March 2019 12:52 CET | Original file | N/A |
| article pdf uploaded. | 19 October 2015 16:19 CEST | Version of Record | https://www.mdpi.com/2076-0787/4/4/661/pdf |
