| article html file updated | 30 August 2025 21:18 CEST | Update | https://www.mdpi.com/2073-4409/8/6/609 |
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| article pdf uploaded. | 18 June 2019 11:53 CEST | Version of Record | https://www.mdpi.com/2073-4409/8/6/609/pdf |
| article xml uploaded. | 18 June 2019 11:53 CEST | Update | https://www.mdpi.com/2073-4409/8/6/609/xml |
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