| article html file updated | 6 February 2020 12:50 CET | Update | https://www.mdpi.com/1999-4893/7/4/523 |
| article html file updated | 22 March 2019 02:35 CET | Update | - |
| article html file updated | 29 March 2016 04:57 CEST | Original file | - |
| article pdf uploaded. | 14 October 2014 16:23 CEST | Version of Record | https://www.mdpi.com/1999-4893/7/4/523/pdf |
