| article html file updated | 6 February 2020 06:18 CET | Update | https://www.mdpi.com/1996-1073/6/12/6569 |
| article html file updated | 7 May 2019 20:41 CEST | Update | - |
| article html file updated | 21 March 2019 09:43 CET | Update | - |
| article html file updated | 18 January 2017 11:37 CET | Original file | - |
| article pdf uploaded. | 18 December 2013 11:52 CET | Version of Record | https://www.mdpi.com/1996-1073/6/12/6569/pdf |
