| article html file updated | 6 February 2020 15:47 CET | Update | https://www.mdpi.com/2306-5338/2/1/23 |
| article html file updated | 7 May 2019 01:19 CEST | Update | - |
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| article pdf uploaded. | 5 February 2015 16:15 CET | Version of Record | https://www.mdpi.com/2306-5338/2/1/23/pdf |
