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| article pdf uploaded. | 10 January 2019 11:31 CET | Updated version of record | https://www.mdpi.com/2076-3425/9/1/6/pdf |
| article xml uploaded. | 10 January 2019 11:31 CET | Update | https://www.mdpi.com/2076-3425/9/1/6/xml |
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| article pdf uploaded. | 7 January 2019 12:08 CET | Version of Record | https://www.mdpi.com/2076-3425/9/1/6/pdf-vor |
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