| article html file updated | 7 February 2020 20:18 CET | Update | https://www.mdpi.com/2227-7080/5/1/2 |
| article html file updated | 22 September 2019 15:13 CEST | Update | N/A |
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| article pdf uploaded. | 26 December 2016 09:55 CET | Version of Record | https://www.mdpi.com/2227-7080/5/1/2/pdf |