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| article pdf uploaded. | 24 January 2014 14:37 CET | Updated version of record | https://www.mdpi.com/2073-4468/3/1/16/pdf |
| article pdf uploaded. | 23 December 2013 11:06 CET | Version of Record | https://www.mdpi.com/2073-4468/3/1/16/pdf-vor |