| article html file updated | 7 February 2020 20:59 CET | Update | https://www.mdpi.com/2073-4395/7/1/6 |
| article html file updated | 22 September 2019 19:02 CEST | Update | - |
| article html file updated | 4 May 2019 16:22 CEST | Update | - |
| article html file updated | 27 March 2017 09:41 CEST | Update | - |
| article html file updated | 11 January 2017 12:51 CET | Original file | - |
| article pdf uploaded. | 7 January 2017 10:13 CET | Version of Record | https://www.mdpi.com/2073-4395/7/1/6/pdf |
