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| article xml uploaded. | 24 February 2018 06:53 CET | Original file | https://www.mdpi.com/1424-8220/18/2/661/xml |
| article pdf uploaded. | 24 February 2018 06:53 CET | Updated version of record | https://www.mdpi.com/1424-8220/18/2/661/pdf |
| article pdf uploaded. | 23 February 2018 16:58 CET | Version of Record | https://www.mdpi.com/1424-8220/18/2/661/pdf-vor |
