| article html file updated | 6 February 2020 00:25 CET | Update | https://www.mdpi.com/1996-1073/6/2/696 |
| article html file updated | 8 May 2019 08:45 CEST | Update | - |
| article html file updated | 20 March 2019 18:17 CET | Update | - |
| article html file updated | 17 February 2017 06:00 CET | Original file | - |
| article pdf uploaded. | 5 February 2013 16:58 CET | Version of Record | https://www.mdpi.com/1996-1073/6/2/696/pdf |
