| article html file updated | 9 February 2020 10:37 CET | Update | https://www.mdpi.com/2079-9268/8/2/9 |
| article html file updated | 1 October 2019 19:45 CEST | Update | - |
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| article xml uploaded. | 21 March 2018 09:24 CET | Update | https://www.mdpi.com/2079-9268/8/2/9/xml |
| article pdf uploaded. | 21 March 2018 09:24 CET | Version of Record | https://www.mdpi.com/2079-9268/8/2/9/pdf |
