| article html file updated | 9 February 2020 00:49 CET | Update | https://www.mdpi.com/2077-1444/9/1/2 |
| article html file updated | 2 May 2019 06:58 CEST | Update | - |
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| article html file updated | 21 December 2017 16:10 CET | Original file | - |
| article xml uploaded. | 21 December 2017 16:09 CET | Original file | https://www.mdpi.com/2077-1444/9/1/2/xml |
| article pdf uploaded. | 21 December 2017 16:09 CET | Version of Record | https://www.mdpi.com/2077-1444/9/1/2/pdf |
