| article html file updated | 6 February 2020 06:57 CET | Update | https://www.mdpi.com/1999-4915/6/2/391 |
| article html file updated | 7 May 2019 19:20 CEST | Update | - |
| article html file updated | 21 March 2019 11:35 CET | Update | - |
| article html file updated | 19 August 2015 18:44 CEST | Update | - |
| article html file updated | 18 March 2014 09:59 CET | Original file | - |
| article xml file uploaded | 18 March 2014 09:59 CET | Original file | https://www.mdpi.com/1999-4915/6/2/391/xml |
| article pdf uploaded. | 27 January 2014 11:36 CET | Version of Record | https://www.mdpi.com/1999-4915/6/2/391/pdf |
