| article html file updated | 7 February 2020 21:22 CET | Update | https://www.mdpi.com/2225-1154/5/1/4 |
| article html file updated | 22 September 2019 20:50 CEST | Update | N/A |
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| article pdf uploaded. | 13 January 2017 04:07 CET | Version of Record | https://www.mdpi.com/2225-1154/5/1/4/pdf |