| article html file updated | 6 February 2020 06:45 CET | Update | https://www.mdpi.com/1999-4915/6/1/284 |
| article html file updated | 7 May 2019 19:45 CEST | Update | - |
| article html file updated | 21 March 2019 11:05 CET | Update | - |
| article html file updated | 19 August 2015 17:30 CEST | Update | - |
| article html file updated | 17 February 2014 12:50 CET | Original file | - |
| article xml file uploaded | 17 February 2014 12:50 CET | Original file | https://www.mdpi.com/1999-4915/6/1/284/xml |
| article pdf uploaded. | 16 January 2014 09:48 CET | Version of Record | https://www.mdpi.com/1999-4915/6/1/284/pdf |
