| article html file updated | 6 February 2020 05:45 CET | Update | https://www.mdpi.com/1424-8247/6/12/1507 |
| article html file updated | 7 May 2019 21:42 CEST | Update | - |
| article html file updated | 21 March 2019 08:13 CET | Update | - |
| article html file updated | 19 August 2015 10:51 CEST | Update | - |
| article html file updated | 7 January 2014 12:21 CET | Original file | - |
| article xml file uploaded | 7 January 2014 12:21 CET | Original file | https://www.mdpi.com/1424-8247/6/12/1507/xml |
| article pdf uploaded. | 25 November 2013 16:16 CET | Version of Record | https://www.mdpi.com/1424-8247/6/12/1507/pdf |
