| article html file updated | 5 February 2020 12:23 CET | Update | https://www.mdpi.com/1996-1073/2/3/504 |
| article html file updated | 9 May 2019 11:03 CEST | Update | N/A |
| article html file updated | 19 March 2019 18:55 CET | Update | N/A |
| article html file updated | 17 February 2017 05:43 CET | Original file | N/A |
| Addendum published | 26 August 2009 00:00 CEST | Addendum | http://www.mdpi.com/1996-1073/2/3/695 |
