| article html file updated | 6 February 2020 03:00 CET | Update | https://www.mdpi.com/1424-8247/6/7/851 |
| article html file updated | 8 May 2019 03:16 CEST | Update | - |
| article html file updated | 21 March 2019 00:44 CET | Update | - |
| article html file updated | 17 June 2015 10:56 CEST | Original file | - |
| article pdf uploaded. | 5 July 2013 16:54 CEST | Updated version of record | https://www.mdpi.com/1424-8247/6/7/851/pdf |
| article pdf uploaded. | 4 July 2013 14:22 CEST | Version of Record | https://www.mdpi.com/1424-8247/6/7/851/pdf-vor |
