| article html file updated | 9 February 2020 00:08 CET | Update | https://www.mdpi.com/2218-6581/6/4/40 |
| article html file updated | 29 September 2019 05:35 CEST | Update | - |
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| article pdf uploaded. | 14 December 2017 15:54 CET | Version of Record | https://www.mdpi.com/2218-6581/6/4/40/pdf |