| article html file updated | 6 February 2020 02:55 CET | Update | https://www.mdpi.com/1424-8247/6/7/837 |
| article html file updated | 8 May 2019 03:26 CEST | Update | - |
| article html file updated | 21 March 2019 00:32 CET | Update | - |
| article html file updated | 17 June 2015 10:46 CEST | Update | - |
| article html file updated | 14 August 2014 12:04 CEST | Original file | - |
| article xml file uploaded | 14 August 2014 12:04 CEST | Original file | https://www.mdpi.com/1424-8247/6/7/837/xml |
| article pdf uploaded. | 3 July 2013 15:17 CEST | Updated version of record | https://www.mdpi.com/1424-8247/6/7/837/pdf |
| article pdf uploaded. | 1 July 2013 14:53 CEST | Version of Record | https://www.mdpi.com/1424-8247/6/7/837/pdf-vor |
