| article html file updated | 7 February 2020 17:47 CET | Update | https://www.mdpi.com/1424-8247/9/4/71 |
| article html file updated | 22 September 2019 05:14 CEST | Update | - |
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| article pdf uploaded. | 10 November 2016 09:32 CET | Version of Record | https://www.mdpi.com/1424-8247/9/4/71/pdf |
