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| article pdf uploaded. | 7 November 2018 06:25 CET | Updated version of record | https://www.mdpi.com/2077-1312/6/4/130/pdf |
| article xml uploaded. | 7 November 2018 06:25 CET | Update | https://www.mdpi.com/2077-1312/6/4/130/xml |
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| article pdf uploaded. | 6 November 2018 13:59 CET | Version of Record | https://www.mdpi.com/2077-1312/6/4/130/pdf-vor |
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