| article html file updated | 7 February 2020 18:18 CET | Update | https://www.mdpi.com/2227-9067/3/4/32 |
| article html file updated | 22 September 2019 06:10 CEST | Update | - |
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| article pdf uploaded. | 19 November 2016 10:35 CET | Version of Record | https://www.mdpi.com/2227-9067/3/4/32/pdf |
