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| article pdf uploaded. | 29 November 2018 11:27 CET | Updated version of record | https://www.mdpi.com/2227-9717/6/12/239/pdf |
| article xml uploaded. | 29 November 2018 11:27 CET | Update | https://www.mdpi.com/2227-9717/6/12/239/xml |
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| article pdf uploaded. | 23 November 2018 16:15 CET | Updated version of record | https://www.mdpi.com/2227-9717/6/12/239/pdf-vor |
| article pdf uploaded. | 23 November 2018 16:14 CET | Version of Record | https://www.mdpi.com/2227-9717/6/12/239/pdf-vor |
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