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| article html file updated | 8 May 2019 09:38 CEST | Update | - |
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| article html file updated | 8 February 2013 09:34 CET | Update | - |
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| article pdf uploaded. | 22 January 2013 15:47 CET | Updated version of record | https://www.mdpi.com/2079-4983/4/1/14/pdf |
| article pdf uploaded. | 18 January 2013 09:47 CET | Version of Record | https://www.mdpi.com/2079-4983/4/1/14/pdf-vor |