| article html file updated | 7 February 2020 10:04 CET | Update | https://www.mdpi.com/2223-7747/5/2/26 |
| article html file updated | 5 May 2019 13:08 CEST | Update | - |
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| article pdf uploaded. | 13 June 2016 09:10 CEST | Version of Record | https://www.mdpi.com/2223-7747/5/2/26/pdf |
