| article html file updated | 9 February 2020 04:21 CET | Update | https://www.mdpi.com/2079-9268/8/1/2 |
| article html file updated | 30 September 2019 05:28 CEST | Update | N/A |
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| article pdf uploaded. | 25 January 2018 16:23 CET | Version of Record | https://www.mdpi.com/2079-9268/8/1/2/pdf |