| article html file updated | 7 February 2020 07:36 CET | Update | https://www.mdpi.com/2227-9040/4/2/7 |
| article html file updated | 5 May 2019 17:57 CEST | Update | - |
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| article html file updated | 1 July 2016 10:12 CEST | Update | - |
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| article xml uploaded. | 21 April 2016 12:04 CEST | Original file | https://www.mdpi.com/2227-9040/4/2/7/xml |
| article pdf uploaded. | 21 April 2016 12:04 CEST | Version of Record | https://www.mdpi.com/2227-9040/4/2/7/pdf |
