| article html file updated | 8 February 2020 18:39 CET | Update | https://www.mdpi.com/1424-2818/9/4/47 |
| article html file updated | 27 September 2019 19:33 CEST | Update | - |
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| article pdf uploaded. | 17 October 2017 11:15 CEST | Version of Record | https://www.mdpi.com/1424-2818/9/4/47/pdf |
