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| article pdf uploaded. | 21 September 2018 11:29 CEST | Updated version of record | https://www.mdpi.com/2079-3197/6/4/52/pdf |
| article xml uploaded. | 21 September 2018 11:29 CEST | Update | https://www.mdpi.com/2079-3197/6/4/52/xml |
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| article pdf uploaded. | 20 September 2018 15:17 CEST | Updated version of record | https://www.mdpi.com/2079-3197/6/4/52/pdf-vor |
| article pdf uploaded. | 20 September 2018 15:16 CEST | Version of Record | https://www.mdpi.com/2079-3197/6/4/52/pdf-vor |
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