| article html file updated | 7 February 2020 06:50 CET | Update | https://www.mdpi.com/2073-4395/6/2/21 |
| article html file updated | 5 May 2019 19:34 CEST | Update | - |
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| article html file updated | 30 June 2016 07:40 CEST | Update | - |
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| article xml uploaded. | 5 April 2016 12:00 CEST | Original file | https://www.mdpi.com/2073-4395/6/2/21/xml |
| article pdf uploaded. | 5 April 2016 12:00 CEST | Version of Record | https://www.mdpi.com/2073-4395/6/2/21/pdf |
