| article html file updated | 6 February 2020 08:19 CET | Update | https://www.mdpi.com/1999-4915/6/4/1502 |
| article html file updated | 7 May 2019 16:30 CEST | Update | - |
| article html file updated | 21 March 2019 14:50 CET | Update | - |
| article html file updated | 20 August 2015 01:57 CEST | Update | - |
| article html file updated | 12 May 2014 15:34 CEST | Original file | - |
| article xml file uploaded | 12 May 2014 15:34 CEST | Original file | https://www.mdpi.com/1999-4915/6/4/1502/xml |
| article pdf uploaded. | 2 April 2014 09:00 CEST | Version of Record | https://www.mdpi.com/1999-4915/6/4/1502/pdf |
