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| article pdf uploaded. | 13 October 2018 11:59 CEST | Updated version of record | https://www.mdpi.com/2218-6581/7/4/64/pdf |
| article xml uploaded. | 13 October 2018 11:59 CEST | Update | https://www.mdpi.com/2218-6581/7/4/64/xml |
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| article pdf uploaded. | 12 October 2018 14:39 CEST | Updated version of record | https://www.mdpi.com/2218-6581/7/4/64/pdf-vor |
| article pdf uploaded. | 12 October 2018 14:34 CEST | Version of Record | https://www.mdpi.com/2218-6581/7/4/64/pdf-vor |
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