| article html file updated | 29 August 2025 20:53 CEST | Update | https://www.mdpi.com/1999-4923/5/4/621 |
| article html file updated | 15 July 2022 22:45 CEST | Update | - |
| article html file updated | 6 February 2020 06:12 CET | Update | - |
| article html file updated | 7 May 2019 20:51 CEST | Update | - |
| article html file updated | 21 March 2019 09:27 CET | Update | - |
| article html file updated | 19 August 2015 13:38 CEST | Update | - |
| article html file updated | 7 January 2014 12:39 CET | Original file | - |
| article xml file uploaded | 7 January 2014 12:39 CET | Original file | https://www.mdpi.com/1999-4923/5/4/621/xml |
| article pdf uploaded. | 16 December 2013 20:09 CET | Updated version of record | https://www.mdpi.com/1999-4923/5/4/621/pdf |
| article pdf uploaded. | 16 December 2013 20:09 CET | Updated version of record | - |
| article pdf uploaded. | 13 December 2013 17:15 CET | Version of Record | - |
