| article html file updated | 15 September 2021 13:43 CEST | Update | https://www.mdpi.com/1996-1073/11/4/709 |
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| article xml uploaded. | 22 March 2018 02:24 CET | Update | https://www.mdpi.com/1996-1073/11/4/709/xml |
| article pdf uploaded. | 22 March 2018 02:24 CET | Version of Record | https://www.mdpi.com/1996-1073/11/4/709/pdf |