| article html file updated | 7 February 2020 06:45 CET | Update | https://www.mdpi.com/1996-1073/9/4/255 |
| article html file updated | 5 May 2019 19:43 CEST | Update | - |
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| article xml uploaded. | 1 April 2016 15:00 CEST | Update | https://www.mdpi.com/1996-1073/9/4/255/xml |
| article pdf uploaded. | 1 April 2016 15:00 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/255/pdf |
