| article html file updated | 8 February 2020 06:52 CET | Update | https://www.mdpi.com/2223-7747/6/2/22 |
| article html file updated | 25 September 2019 01:10 CEST | Update | - |
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| article pdf uploaded. | 27 May 2017 09:35 CEST | Version of Record | https://www.mdpi.com/2223-7747/6/2/22/pdf |
