| article html file updated | 6 February 2020 07:42 CET | Update | https://www.mdpi.com/2223-7747/3/1/160 |
| article html file updated | 7 May 2019 17:44 CEST | Update | - |
| article html file updated | 21 March 2019 13:24 CET | Update | - |
| article html file updated | 19 August 2015 22:41 CEST | Original file | - |
| article pdf uploaded. | 5 March 2014 11:53 CET | Version of Record | https://www.mdpi.com/2223-7747/3/1/160/pdf |
