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| article pdf uploaded. | 11 October 2018 04:40 CEST | Updated version of record | https://www.mdpi.com/2075-1729/8/4/44/pdf |
| article xml uploaded. | 11 October 2018 04:40 CEST | Update | https://www.mdpi.com/2075-1729/8/4/44/xml |
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| article pdf uploaded. | 2 October 2018 17:19 CEST | Updated version of record | https://www.mdpi.com/2075-1729/8/4/44/pdf-vor |
| article pdf uploaded. | 2 October 2018 17:14 CEST | Version of Record | https://www.mdpi.com/2075-1729/8/4/44/pdf-vor |
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