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| article pdf uploaded. | 20 September 2019 10:06 CEST | Updated version of record | https://www.mdpi.com/2311-5521/4/3/172/pdf |
| article xml uploaded. | 20 September 2019 10:06 CEST | Update | https://www.mdpi.com/2311-5521/4/3/172/xml |
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| article pdf uploaded. | 16 September 2019 15:40 CEST | Version of Record | https://www.mdpi.com/2311-5521/4/3/172/pdf-vor |
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