| article html file updated | 9 February 2020 03:10 CET | Update | https://www.mdpi.com/2313-5778/2/1/4 |
| article html file updated | 2 May 2019 02:02 CEST | Update | - |
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| article xml uploaded. | 15 January 2018 17:11 CET | Original file | https://www.mdpi.com/2313-5778/2/1/4/xml |
| article pdf uploaded. | 15 January 2018 17:11 CET | Version of Record | https://www.mdpi.com/2313-5778/2/1/4/pdf |
