| article html file updated | 7 February 2020 18:04 CET | Update | https://www.mdpi.com/2227-9067/3/4/30 |
| article html file updated | 22 September 2019 05:45 CEST | Update | - |
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| article pdf uploaded. | 16 November 2016 09:45 CET | Version of Record | https://www.mdpi.com/2227-9067/3/4/30/pdf |
