| article html file updated | 6 February 2020 07:41 CET | Update | https://www.mdpi.com/2224-2708/3/1/81 |
| article html file updated | 7 May 2019 17:47 CEST | Update | - |
| article html file updated | 21 March 2019 13:21 CET | Original file | - |
| article pdf uploaded. | 5 March 2014 16:44 CET | Updated version of record | https://www.mdpi.com/2224-2708/3/1/81/pdf |
| article pdf uploaded. | 4 March 2014 15:13 CET | Version of Record | https://www.mdpi.com/2224-2708/3/1/81/pdf-vor |
