| article html file updated | 9 February 2020 00:30 CET | Update | https://www.mdpi.com/2413-8851/1/4/40 |
| article html file updated | 29 September 2019 07:46 CEST | Update | - |
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| article xml uploaded. | 19 December 2017 10:32 CET | Original file | https://www.mdpi.com/2413-8851/1/4/40/xml |
| article pdf uploaded. | 19 December 2017 10:32 CET | Version of Record | https://www.mdpi.com/2413-8851/1/4/40/pdf |
