| article html file updated | 8 February 2020 07:42 CET | Update | https://www.mdpi.com/1999-4923/9/2/21 |
| article html file updated | 25 September 2019 05:27 CEST | Update | - |
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| article html file updated | 29 June 2017 12:45 CEST | Update | - |
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| article xml uploaded. | 7 June 2017 13:16 CEST | Original file | https://www.mdpi.com/1999-4923/9/2/21/xml |
| article pdf uploaded. | 7 June 2017 13:16 CEST | Version of Record | https://www.mdpi.com/1999-4923/9/2/21/pdf |
