| article html file updated | 7 February 2020 17:55 CET | Update | https://www.mdpi.com/2227-7102/6/4/37 |
| article html file updated | 4 May 2019 22:42 CEST | Update | - |
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| article pdf uploaded. | 12 November 2016 07:13 CET | Version of Record | https://www.mdpi.com/2227-7102/6/4/37/pdf |
