| article html file updated | 5 February 2020 14:09 CET | Update | https://www.mdpi.com/1996-1073/3/4/686 |
| article html file updated | 18 September 2019 22:19 CEST | Update | - |
| article html file updated | 9 May 2019 07:10 CEST | Update | - |
| article html file updated | 19 March 2019 23:34 CET | Update | - |
| article html file updated | 13 January 2017 08:17 CET | Original file | - |
| Correction published | 11 May 2010 00:00 CEST | Correction | http://www.mdpi.com/1996-1073/3/5/973 |
