| article html file updated | 29 August 2025 20:32 CEST | Update | https://www.mdpi.com/1996-1073/6/1/492 |
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| article pdf uploaded. | 18 January 2013 14:08 CET | Updated version of record | https://www.mdpi.com/1996-1073/6/1/492/pdf |
| article pdf uploaded. | 17 January 2013 12:27 CET | Version of Record | https://www.mdpi.com/1996-1073/6/1/492/pdf-vor |
