| article html file updated | 7 February 2020 21:12 CET | Update | https://www.mdpi.com/2078-2489/8/1/9 |
| article html file updated | 22 September 2019 19:58 CEST | Update | - |
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| article html file updated | 30 March 2017 03:23 CEST | Update | - |
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| article xml uploaded. | 11 January 2017 14:56 CET | Original file | https://www.mdpi.com/2078-2489/8/1/9/xml |
| article pdf uploaded. | 11 January 2017 14:56 CET | Version of Record | https://www.mdpi.com/2078-2489/8/1/9/pdf |
