| article html file updated | 6 February 2020 05:52 CET | Update | https://www.mdpi.com/2220-9964/2/4/1106 |
| article html file updated | 7 May 2019 21:29 CEST | Update | - |
| article html file updated | 21 March 2019 08:30 CET | Update | - |
| article html file updated | 19 August 2015 11:43 CEST | Original file | - |
| article pdf uploaded. | 28 November 2013 16:16 CET | Version of Record | https://www.mdpi.com/2220-9964/2/4/1106/pdf |
