| article html file updated | 6 February 2020 00:20 CET | Update | https://www.mdpi.com/2071-1050/5/2/456 |
| article html file updated | 8 May 2019 09:00 CEST | Update | - |
| article html file updated | 20 March 2019 18:04 CET | Update | - |
| article html file updated | 17 June 2015 06:03 CEST | Update | - |
| article html file updated | 8 February 2013 09:47 CET | Original file | - |
| article pdf uploaded. | 1 February 2013 10:46 CET | Updated version of record | https://www.mdpi.com/2071-1050/5/2/456/pdf |
| article pdf uploaded. | 31 January 2013 12:02 CET | Version of Record | https://www.mdpi.com/2071-1050/5/2/456/pdf-vor |
