| article html file updated | 6 February 2020 12:04 CET | Update | https://www.mdpi.com/2071-1050/6/9/6088 |
| article html file updated | 7 May 2019 08:37 CEST | Update | - |
| article html file updated | 22 March 2019 00:29 CET | Update | - |
| article html file updated | 20 August 2015 17:46 CEST | Original file | - |
| article pdf uploaded. | 11 September 2014 09:47 CEST | Updated version of record | https://www.mdpi.com/2071-1050/6/9/6088/pdf |
| article pdf uploaded. | 9 September 2014 08:12 CEST | Version of Record | https://www.mdpi.com/2071-1050/6/9/6088/pdf-vor |
