| article html file updated | 7 February 2020 20:39 CET | Update | https://www.mdpi.com/2073-4395/7/1/2 |
| article html file updated | 22 September 2019 17:10 CEST | Update | - |
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| article html file updated | 27 March 2017 09:40 CEST | Update | - |
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| article xml uploaded. | 1 January 2017 07:48 CET | Original file | https://www.mdpi.com/2073-4395/7/1/2/xml |
| article pdf uploaded. | 1 January 2017 07:48 CET | Version of Record | https://www.mdpi.com/2073-4395/7/1/2/pdf |
