| article html file updated | 8 February 2020 04:54 CET | Update | https://www.mdpi.com/2311-7524/3/2/31 |
| article html file updated | 24 September 2019 15:00 CEST | Update | - |
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| article pdf uploaded. | 3 May 2017 07:46 CEST | Version of Record | https://www.mdpi.com/2311-7524/3/2/31/pdf |
