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| article pdf uploaded. | 17 December 2018 09:37 CET | Updated version of record | https://www.mdpi.com/2075-4426/8/4/44/pdf |
| article xml uploaded. | 17 December 2018 09:37 CET | Update | https://www.mdpi.com/2075-4426/8/4/44/xml |
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| article pdf uploaded. | 13 December 2018 17:32 CET | Updated version of record | https://www.mdpi.com/2075-4426/8/4/44/pdf-vor |
| article pdf uploaded. | 13 December 2018 17:22 CET | Version of Record | https://www.mdpi.com/2075-4426/8/4/44/pdf-vor |
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