| article html file updated | 12 August 2026 21:09 CEST | Update | https://www.mdpi.com/1996-1073/6/12/6137 |
| article html file updated | 6 February 2020 05:45 CET | Update | N/A |
| article html file updated | 7 May 2019 21:42 CEST | Update | N/A |
| article html file updated | 21 March 2019 08:13 CET | Update | N/A |
| article html file updated | 18 January 2017 11:37 CET | Original file | N/A |
| article pdf uploaded. | 26 November 2013 17:40 CET | Updated version of record | https://www.mdpi.com/1996-1073/6/12/6137/pdf |
| article pdf uploaded. | 25 November 2013 17:00 CET | Version of Record | https://www.mdpi.com/1996-1073/6/12/6137/pdf-vor |
