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| article xml uploaded. | 30 January 2018 11:33 CET | Original file | https://www.mdpi.com/2227-7080/6/1/19/xml |
| article pdf uploaded. | 30 January 2018 11:33 CET | Updated version of record | https://www.mdpi.com/2227-7080/6/1/19/pdf |
| article pdf uploaded. | 28 January 2018 12:50 CET | Version of Record | https://www.mdpi.com/2227-7080/6/1/19/pdf-vor |
