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| article pdf uploaded. | 23 October 2018 07:21 CEST | Updated version of record | https://www.mdpi.com/2076-3417/8/10/1996/pdf | 
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| article pdf uploaded. | 20 October 2018 12:57 CEST | Version of Record | https://www.mdpi.com/2076-3417/8/10/1996/pdf-vor | 
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