| article html file updated | 6 February 2020 04:07 CET | Update | https://www.mdpi.com/2224-2708/2/3/614 |
| article html file updated | 8 May 2019 01:00 CEST | Update | - |
| article html file updated | 21 March 2019 03:57 CET | Update | - |
| article html file updated | 17 June 2015 12:49 CEST | Original file | - |
| article pdf uploaded. | 5 September 2013 14:14 CEST | Updated version of record | https://www.mdpi.com/2224-2708/2/3/614/pdf |
| article pdf uploaded. | 2 September 2013 12:30 CEST | Version of Record | https://www.mdpi.com/2224-2708/2/3/614/pdf-vor |
