| article html file updated | 30 August 2025 08:12 CEST | Update | https://www.mdpi.com/2218-2004/6/4/57 |
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| article pdf uploaded. | 26 October 2018 12:17 CEST | Version of Record | https://www.mdpi.com/2218-2004/6/4/57/pdf |
| article xml uploaded. | 26 October 2018 12:17 CEST | Update | https://www.mdpi.com/2218-2004/6/4/57/xml |
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