| article html file updated | 7 February 2020 03:43 CET | Update | https://www.mdpi.com/2306-5338/3/1/4 |
| article html file updated | 6 May 2019 02:01 CEST | Update | - |
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| article xml uploaded. | 21 January 2016 10:50 CET | Original file | https://www.mdpi.com/2306-5338/3/1/4/xml |
| article pdf uploaded. | 21 January 2016 10:50 CET | Version of Record | https://www.mdpi.com/2306-5338/3/1/4/pdf |
