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| article pdf uploaded. | 25 December 2018 09:13 CET | Updated version of record | https://www.mdpi.com/2227-9717/7/1/6/pdf |
| article xml uploaded. | 25 December 2018 09:13 CET | Update | https://www.mdpi.com/2227-9717/7/1/6/xml |
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| article pdf uploaded. | 21 December 2018 17:55 CET | Updated version of record | https://www.mdpi.com/2227-9717/7/1/6/pdf-vor |
| article pdf uploaded. | 21 December 2018 17:52 CET | Version of Record | https://www.mdpi.com/2227-9717/7/1/6/pdf-vor |
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