| article html file updated | 9 February 2020 03:24 CET | Update | https://www.mdpi.com/2075-4663/6/1/4 |
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| article xml uploaded. | 17 January 2018 15:49 CET | Original file | https://www.mdpi.com/2075-4663/6/1/4/xml |
| article pdf uploaded. | 17 January 2018 15:49 CET | Version of Record | https://www.mdpi.com/2075-4663/6/1/4/pdf |