| article html file updated | 8 February 2020 21:46 CET | Update | https://www.mdpi.com/2227-7390/5/4/67 |
| article html file updated | 28 September 2019 15:15 CEST | Update | N/A |
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| article pdf uploaded. | 21 November 2017 13:23 CET | Version of Record | https://www.mdpi.com/2227-7390/5/4/67/pdf |
