| article html file updated | 7 February 2020 08:00 CET | Update | https://www.mdpi.com/2304-8158/5/2/33 |
| article html file updated | 5 May 2019 17:09 CEST | Update | N/A |
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| article pdf uploaded. | 29 April 2016 14:07 CEST | Version of Record | https://www.mdpi.com/2304-8158/5/2/33/pdf |