| article html file updated | 6 February 2020 00:17 CET | Update | https://www.mdpi.com/1996-1073/6/2/634 |
| article html file updated | 8 May 2019 09:07 CEST | Update | - |
| article html file updated | 20 March 2019 17:56 CET | Update | - |
| article html file updated | 14 February 2017 11:29 CET | Original file | - |
| article pdf uploaded. | 29 January 2013 13:48 CET | Version of Record | https://www.mdpi.com/1996-1073/6/2/634/pdf |
