| article html file updated | 6 February 2020 15:18 CET | Update | https://www.mdpi.com/1911-8074/8/1/2 |
| article html file updated | 7 May 2019 02:13 CEST | Update | N/A |
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| article pdf uploaded. | 19 January 2015 16:44 CET | Version of Record | https://www.mdpi.com/1911-8074/8/1/2/pdf |
