| article html file updated | 6 February 2020 08:29 CET | Update | https://new.mdpi.com/2071-1050/6/4/1973 |
| article html file updated | 20 September 2019 07:15 CEST | Update | - |
| article html file updated | 7 May 2019 16:08 CEST | Update | - |
| article html file updated | 21 March 2019 15:15 CET | Update | - |
| article html file updated | 20 August 2015 02:42 CEST | Original file | - |
| article pdf uploaded. | 10 April 2014 09:10 CEST | Version of Record | https://new.mdpi.com/2071-1050/6/4/1973/pdf |
