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| article pdf uploaded. | 24 December 2018 17:16 CET | Updated version of record | https://www.mdpi.com/2071-1050/11/1/56/pdf |
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| article pdf uploaded. | 21 December 2018 16:31 CET | Updated version of record | https://www.mdpi.com/2071-1050/11/1/56/pdf-vor |
| article pdf uploaded. | 21 December 2018 16:20 CET | Version of Record | https://www.mdpi.com/2071-1050/11/1/56/pdf-vor |
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