| article html file updated | 6 February 2020 13:13 CET | Update | https://www.mdpi.com/2076-0787/3/4/624 |
| article html file updated | 20 September 2019 14:15 CEST | Update | - |
| article html file updated | 7 May 2019 06:22 CEST | Update | - |
| article html file updated | 25 March 2019 16:44 CET | Update | - |
| article html file updated | 24 March 2017 09:53 CET | Original file | - |
| article pdf uploaded. | 29 October 2014 09:21 CET | Version of Record | https://www.mdpi.com/2076-0787/3/4/624/pdf |
