| article html file updated | 6 February 2020 01:21 CET | Update | https://www.mdpi.com/1996-1073/6/4/1918 |
| article html file updated | 8 May 2019 06:38 CEST | Update | - |
| article html file updated | 20 March 2019 20:36 CET | Original file | - |
| article pdf uploaded. | 3 April 2013 11:31 CEST | Version of Record | https://www.mdpi.com/1996-1073/6/4/1918/pdf |
