| article html file updated | 6 February 2020 22:25 CET | Update | https://www.mdpi.com/2224-2708/4/3/226 |
| article html file updated | 6 May 2019 12:08 CEST | Update | - |
| article html file updated | 26 March 2019 10:00 CET | Original file | - |
| article pdf uploaded. | 2 September 2015 17:05 CEST | Version of Record | https://www.mdpi.com/2224-2708/4/3/226/pdf |
