| article html file updated | 7 February 2020 20:42 CET | Update | https://www.mdpi.com/2078-2489/8/1/7 |
| article html file updated | 22 September 2019 17:26 CEST | Update | - |
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| article html file updated | 30 March 2017 03:23 CEST | Update | - |
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| article xml uploaded. | 3 January 2017 10:15 CET | Original file | https://www.mdpi.com/2078-2489/8/1/7/xml |
| article pdf uploaded. | 3 January 2017 10:15 CET | Version of Record | https://www.mdpi.com/2078-2489/8/1/7/pdf |
