| article html file updated | 8 February 2020 05:35 CET | Update | https://www.mdpi.com/2227-9709/4/2/11 |
| article html file updated | 24 September 2019 18:28 CEST | Update | N/A |
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| article pdf uploaded. | 11 May 2017 16:31 CEST | Version of Record | https://www.mdpi.com/2227-9709/4/2/11/pdf |
