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| article pdf uploaded. | 2 March 2020 13:43 CET | Updated version of record | https://www.mdpi.com/2304-6775/8/1/6/pdf |
| article xml uploaded. | 2 March 2020 13:43 CET | Update | https://www.mdpi.com/2304-6775/8/1/6/xml |
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| article pdf uploaded. | 2 March 2020 13:28 CET | Updated version of record | https://www.mdpi.com/2304-6775/8/1/6/pdf-vor |
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| article pdf uploaded. | 21 January 2020 13:25 CET | Version of Record | https://www.mdpi.com/2304-6775/8/1/6/pdf-vor |
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