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| article xml uploaded. | 13 March 2018 11:01 CET | Original file | https://www.mdpi.com/2227-7072/6/1/31/xml |
| article pdf uploaded. | 13 March 2018 11:01 CET | Updated version of record | https://www.mdpi.com/2227-7072/6/1/31/pdf |
| article pdf uploaded. | 12 March 2018 16:43 CET | Version of Record | https://www.mdpi.com/2227-7072/6/1/31/pdf-vor |
