| article html file updated | 6 February 2020 08:31 CET | Update | https://www.mdpi.com/2071-1050/6/4/2031 |
| article html file updated | 7 May 2019 16:04 CEST | Update | - |
| article html file updated | 21 March 2019 15:18 CET | Update | - |
| article html file updated | 20 August 2015 02:49 CEST | Update | - |
| article html file updated | 24 June 2014 12:26 CEST | Original file | - |
| article xml file uploaded | 24 June 2014 12:26 CEST | Original file | https://www.mdpi.com/2071-1050/6/4/2031/xml |
| article pdf uploaded. | 11 April 2014 17:20 CEST | Updated version of record | https://www.mdpi.com/2071-1050/6/4/2031/pdf |
| article pdf uploaded. | 10 April 2014 11:35 CEST | Version of Record | https://www.mdpi.com/2071-1050/6/4/2031/pdf-vor |
