| article html file updated | 6 February 2020 00:22 CET | Update | https://www.mdpi.com/1424-2818/5/1/39 |
| article html file updated | 8 May 2019 08:54 CEST | Update | - |
| article html file updated | 20 March 2019 18:09 CET | Update | - |
| article html file updated | 17 June 2015 06:07 CEST | Update | - |
| article html file updated | 8 February 2013 09:50 CET | Original file | - |
| article pdf uploaded. | 5 February 2013 16:20 CET | Updated version of record | https://www.mdpi.com/1424-2818/5/1/39/pdf |
| article pdf uploaded. | 4 February 2013 10:28 CET | Version of Record | https://www.mdpi.com/1424-2818/5/1/39/pdf-vor |
