| article html file updated | 16 June 2015 16:46 CEST | Update | https://www.mdpi.com/1424-8247/4/6/880 |
| article html file updated | 13 June 2014 12:14 CEST | Update | - |
| article xml file uploaded | 13 June 2014 12:13 CEST | Original file | https://www.mdpi.com/1424-8247/4/6/880/xml |
| article html file updated | 6 February 2013 21:30 CET | Update | - |
| article html file updated | 6 February 2013 01:21 CET | Update | - |
| article html file updated | 28 January 2013 22:45 CET | Update | - |
| article html file updated | 26 January 2013 03:07 CET | Update | - |
| article html file updated | 22 January 2013 17:45 CET | Original file | - |
