| article html file updated | 7 February 2020 17:43 CET | Update | https://www.mdpi.com/2411-5134/1/4/23 |
| article html file updated | 4 May 2019 23:05 CEST | Update | - |
| article html file updated | 9 November 2016 05:26 CET | Original file | - |
| article xml uploaded. | 9 November 2016 05:25 CET | Update | https://www.mdpi.com/2411-5134/1/4/23/xml |
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| article pdf uploaded. | 9 November 2016 05:23 CET | Version of Record | https://www.mdpi.com/2411-5134/1/4/23/pdf |
