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| article pdf uploaded. | 14 December 2018 11:24 CET | Updated version of record | https://www.mdpi.com/2227-9717/6/12/260/pdf |
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| article pdf uploaded. | 10 December 2018 17:14 CET | Updated version of record | https://www.mdpi.com/2227-9717/6/12/260/pdf-vor |
| article pdf uploaded. | 10 December 2018 17:11 CET | Version of Record | https://www.mdpi.com/2227-9717/6/12/260/pdf-vor |
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