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| article pdf uploaded. | 14 December 2018 10:26 CET | Updated version of record | https://www.mdpi.com/2227-7390/6/12/311/pdf |
| article xml uploaded. | 14 December 2018 10:26 CET | Update | https://www.mdpi.com/2227-7390/6/12/311/xml |
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| article pdf uploaded. | 7 December 2018 15:14 CET | Updated version of record | https://www.mdpi.com/2227-7390/6/12/311/pdf-vor |
| article pdf uploaded. | 7 December 2018 14:52 CET | Version of Record | https://www.mdpi.com/2227-7390/6/12/311/pdf-vor |
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