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| article pdf uploaded. | 15 November 2018 11:11 CET | Updated version of record | https://www.mdpi.com/2227-9040/6/4/52/pdf |
| article xml uploaded. | 15 November 2018 11:11 CET | Update | https://www.mdpi.com/2227-9040/6/4/52/xml |
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| article pdf uploaded. | 12 November 2018 12:44 CET | Version of Record | https://www.mdpi.com/2227-9040/6/4/52/pdf-vor |
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