| article html file updated | 9 February 2020 03:16 CET | Update | https://www.mdpi.com/2218-1989/8/1/7 |
| article html file updated | 2 May 2019 01:50 CEST | Update | - |
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| article xml uploaded. | 16 January 2018 14:53 CET | Original file | https://www.mdpi.com/2218-1989/8/1/7/xml |
| article pdf uploaded. | 16 January 2018 14:53 CET | Version of Record | https://www.mdpi.com/2218-1989/8/1/7/pdf |
