| article html file updated | 6 February 2020 12:04 CET | Update | https://www.mdpi.com/2071-1050/6/9/6107 |
| article html file updated | 7 May 2019 08:37 CEST | Update | N/A |
| article html file updated | 22 March 2019 00:29 CET | Update | N/A |
| article html file updated | 20 August 2015 17:47 CEST | Original file | N/A |
| article pdf uploaded. | 9 September 2014 08:16 CEST | Version of Record | https://www.mdpi.com/2071-1050/6/9/6107/pdf |
