| article html file updated | 28 September 2025 19:19 CEST | Update | https://www.mdpi.com/1999-4893/6/2/309 |
| article html file updated | 29 August 2025 20:39 CEST | Update | - |
| article html file updated | 15 July 2022 22:18 CEST | Update | - |
| article html file updated | 6 February 2020 02:10 CET | Update | - |
| article html file updated | 8 May 2019 05:03 CEST | Update | - |
| article html file updated | 20 March 2019 22:40 CET | Update | - |
| article html file updated | 19 December 2016 11:28 CET | Original file | - |
| article pdf uploaded. | 21 May 2013 10:30 CEST | Version of Record | https://www.mdpi.com/1999-4893/6/2/309/pdf |
