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| article pdf uploaded. | 23 September 2019 09:30 CEST | Updated version of record | https://www.mdpi.com/2226-471X/4/3/61/pdf |
| article xml uploaded. | 23 September 2019 09:30 CEST | Update | https://www.mdpi.com/2226-471X/4/3/61/xml |
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| article pdf uploaded. | 2 August 2019 07:23 CEST | Version of Record | https://www.mdpi.com/2226-471X/4/3/61/pdf-vor |
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