| article html file updated | 8 February 2020 06:50 CET | Update | https://www.mdpi.com/2076-0817/6/2/21 |
| article html file updated | 25 September 2019 01:03 CEST | Update | - |
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| article html file updated | 29 June 2017 12:39 CEST | Update | - |
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| article xml uploaded. | 26 May 2017 14:32 CEST | Original file | https://www.mdpi.com/2076-0817/6/2/21/xml |
| article pdf uploaded. | 26 May 2017 14:32 CEST | Version of Record | https://www.mdpi.com/2076-0817/6/2/21/pdf |
