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| article pdf uploaded. | 21 November 2013 19:09 CET | Updated version of record | https://www.mdpi.com/2227-9040/1/3/43/pdf |
| article pdf uploaded. | 20 November 2013 10:06 CET | Version of Record | https://www.mdpi.com/2227-9040/1/3/43/pdf-vor |
