| article html file updated | 6 February 2020 05:09 CET | Update | https://www.mdpi.com/1999-4923/5/4/570 |
| article html file updated | 7 May 2019 22:50 CEST | Update | - |
| article html file updated | 21 March 2019 06:39 CET | Update | - |
| article html file updated | 17 June 2015 14:17 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/1999-4923/5/4/570/xml |
| article pdf uploaded. | 25 October 2013 13:37 CEST | Version of Record | https://www.mdpi.com/1999-4923/5/4/570/pdf |
