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| article pdf uploaded. | 6 September 2018 03:59 CEST | Updated version of record | https://www.mdpi.com/2313-433X/4/9/107/pdf |
| article xml uploaded. | 6 September 2018 03:59 CEST | Update | https://www.mdpi.com/2313-433X/4/9/107/xml |
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| article pdf uploaded. | 4 September 2018 20:35 CEST | Version of Record | https://www.mdpi.com/2313-433X/4/9/107/pdf-vor |
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