| article html file updated | 29 August 2025 21:14 CEST | Update | https://www.mdpi.com/2227-9067/1/2/208 |
| article html file updated | 15 July 2022 23:23 CEST | Update | N/A |
| article html file updated | 6 February 2020 12:11 CET | Update | N/A |
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| article html file updated | 20 August 2015 18:50 CEST | Original file | N/A |
| article pdf uploaded. | 15 September 2014 09:59 CEST | Updated version of record | https://www.mdpi.com/2227-9067/1/2/208/pdf |
| article pdf uploaded. | 12 September 2014 13:18 CEST | Version of Record | https://www.mdpi.com/2227-9067/1/2/208/pdf-vor |
