| article html file updated | 6 February 2020 06:15 CET | Update | https://www.mdpi.com/1999-4923/5/4/634 |
| article html file updated | 7 May 2019 20:45 CEST | Update | - |
| article html file updated | 21 March 2019 09:35 CET | Update | - |
| article html file updated | 19 August 2015 13:57 CEST | Update | - |
| article html file updated | 7 January 2014 12:39 CET | Original file | - |
| article xml file uploaded | 7 January 2014 12:39 CET | Original file | https://www.mdpi.com/1999-4923/5/4/634/xml |
| article pdf uploaded. | 16 December 2013 19:42 CET | Version of Record | https://www.mdpi.com/1999-4923/5/4/634/pdf |
