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| article pdf uploaded. | 21 January 2019 07:59 CET | Updated version of record | https://www.mdpi.com/2227-7099/6/2/34/pdf |
| article html file updated | 28 June 2018 08:46 CEST | Update | N/A |
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| article pdf uploaded. | 28 May 2018 10:42 CEST | Version of Record | https://www.mdpi.com/2227-7099/6/2/34/pdf-vor |
| article xml uploaded. | 28 May 2018 10:42 CEST | Update | https://www.mdpi.com/2227-7099/6/2/34/xml |
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