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| article pdf uploaded. | 16 October 2017 03:55 CEST | Updated version of record | https://www.mdpi.com/2073-4360/9/10/503/pdf |
| article xml uploaded. | 16 October 2017 03:54 CEST | Original file | https://www.mdpi.com/2073-4360/9/10/503/xml |
| article pdf uploaded. | 12 October 2017 17:31 CEST | Version of Record | https://www.mdpi.com/2073-4360/9/10/503/pdf-vor |
