| article html file updated | 7 February 2020 08:44 CET | Update | https://www.mdpi.com/2077-0375/6/2/28 |
| article html file updated | 5 May 2019 15:44 CEST | Update | - |
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| article html file updated | 4 July 2016 05:07 CEST | Update | - |
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| article xml uploaded. | 16 May 2016 13:05 CEST | Original file | https://www.mdpi.com/2077-0375/6/2/28/xml |
| article pdf uploaded. | 16 May 2016 13:05 CEST | Version of Record | https://www.mdpi.com/2077-0375/6/2/28/pdf |
