| article html file updated | 6 February 2020 14:07 CET | Update | https://www.mdpi.com/2073-8994/6/4/975 |
| article html file updated | 7 May 2019 04:36 CEST | Update | - |
| article html file updated | 25 March 2019 18:41 CET | Update | - |
| article html file updated | 21 August 2015 03:13 CEST | Update | - |
| article html file updated | 31 December 2014 03:31 CET | Original file | - |
| article xml file uploaded | 31 December 2014 03:31 CET | Original file | https://www.mdpi.com/2073-8994/6/4/975/xml |
| article pdf uploaded. | 2 December 2014 13:30 CET | Version of Record | https://www.mdpi.com/2073-8994/6/4/975/pdf |
