| article html file updated | 6 February 2020 10:37 CET | Update | https://www.mdpi.com/2073-4360/6/7/1972 |
| article html file updated | 7 May 2019 11:48 CEST | Update | - |
| article html file updated | 21 March 2019 20:36 CET | Update | - |
| article html file updated | 20 August 2015 12:27 CEST | Original file | - |
| article pdf uploaded. | 10 July 2014 14:23 CEST | Version of Record | https://www.mdpi.com/2073-4360/6/7/1972/pdf |
