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| article pdf uploaded. | 20 December 2016 06:59 CET | Updated version of record | https://www.mdpi.com/1424-8220/16/12/2174/pdf |
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| article xml uploaded. | 19 December 2016 13:21 CET | Original file | https://www.mdpi.com/1424-8220/16/12/2174/xml |
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| article pdf uploaded. | 18 December 2016 09:26 CET | Version of Record | https://www.mdpi.com/1424-8220/16/12/2174/pdf-vor |