| article html file updated | 6 February 2020 00:08 CET | Update | https://www.mdpi.com/2073-4360/5/1/56 |
| article html file updated | 8 May 2019 09:30 CEST | Update | - |
| article html file updated | 20 March 2019 17:34 CET | Update | - |
| article html file updated | 17 June 2015 05:40 CEST | Update | - |
| article html file updated | 8 February 2013 09:35 CET | Update | - |
| article html file updated | 7 February 2013 17:55 CET | Original file | - |
| article pdf uploaded. | 22 January 2013 17:07 CET | Updated version of record | https://www.mdpi.com/2073-4360/5/1/56/pdf |
| article pdf uploaded. | 21 January 2013 14:30 CET | Version of Record | https://www.mdpi.com/2073-4360/5/1/56/pdf-vor |
