| article html file updated | 9 February 2020 03:27 CET | Update | https://www.mdpi.com/2413-8851/2/1/6 |
| article html file updated | 30 September 2019 00:29 CEST | Update | - |
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| article html file updated | 18 January 2018 08:03 CET | Original file | - |
| article xml uploaded. | 18 January 2018 08:02 CET | Original file | https://www.mdpi.com/2413-8851/2/1/6/xml |
| article pdf uploaded. | 18 January 2018 08:02 CET | Version of Record | https://www.mdpi.com/2413-8851/2/1/6/pdf |
