| article html file updated | 13 August 2026 12:14 CEST | Update | https://www.mdpi.com/1996-1073/8/2/837 |
| article html file updated | 6 February 2020 15:30 CET | Update | N/A |
| article html file updated | 7 May 2019 01:50 CEST | Update | N/A |
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| article html file updated | 21 August 2015 06:35 CEST | Original file | N/A |
| article pdf uploaded. | 27 January 2015 13:08 CET | Version of Record | https://www.mdpi.com/1996-1073/8/2/837/pdf |
