| article html file updated | 6 February 2020 13:16 CET | Update | https://www.mdpi.com/2076-0787/3/4/645 |
| article html file updated | 20 September 2019 14:22 CEST | Update | - |
| article html file updated | 7 May 2019 06:15 CEST | Update | - |
| article html file updated | 25 March 2019 16:51 CET | Update | - |
| article html file updated | 16 March 2017 06:41 CET | Original file | - |
| article pdf uploaded. | 30 October 2014 12:50 CET | Version of Record | https://www.mdpi.com/2076-0787/3/4/645/pdf |
