| article html file updated | 7 February 2020 06:39 CET | Update | https://www.mdpi.com/1996-1073/9/4/256 |
| article html file updated | 5 May 2019 19:55 CEST | Update | - |
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| article html file updated | 28 April 2016 07:52 CEST | Update | - |
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| article xml uploaded. | 31 March 2016 09:24 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/256/xml |
| article pdf uploaded. | 31 March 2016 09:24 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/256/pdf |
